Answer:
30.7
Step-by-step explanation:
add the 15,3.7 ,and the 12
Which of the following expressions represents the distance between -4/3 and 1/3?
Answer:
none of the above
Step-by-step explanation:
Take the absolute value of the second point and subtract the first point
| 1/3 -( -4/3)|
Since this answer does not match any of the above choices
Answer:
None of the above.
Step-by-step explanation:
The distance between -4/3 and 1/3 is
|1/3-(-4/3)| =|1/3 + 4/3|
This is not in the option so;
None of the above.
What is the missing value from the set of data if the mean is 4?
{5,2,_,2,4,8}
Answer: The missing value from the data set is 4.
Step-by-step explanation: Let's put it from least to greatest to figure it out...
2, 2, (4, 4,) 5, 8,
It would have to be 4, because 8 divided by 2 will equal 4. And because there's an even amount of numbers we have to add two numbers then divide it by 2.
4 + 4 = 8
8 ÷ 2 = 4
The mean is 4, and the missing value from the data set is 4.
I hope this helps!
There are 500 people in a building. 20% of half of them went out. 15% of those who went out came back in. How many people are in the building now?
Answer:
415people
Step-by-step explanation:
20%of250=100people
15%of the 100people=15people
So 100 went out remaining(500-100)400
Then 15 returned=400+15
415
Answer:
458 people in the building now.
Step-by-step explanation:
20%x500/2 = 20% x 250=50
15% x 50 = 7.5
7.5 + (500 - 50) =457.5 =458people.
Tell me if it's correct plz.
Hope this helps..
What’s the correct answer for this?
Answer:
YT AND RQ
Step-by-step explanation:
Wendy has only nickels and dimes in her pocket. The number of dimes is 8 less than triple the number of nickels. Let n represent the number of nickels. Write an expression for the number of dimes.
Answer:
The number of dimes is 3n - 8
Step-by-step explanation:
Here, we are interested in writing an expression for the number of dimes.
We proceed as follows;
Now, there are n nickels with the number of dimes been 8 less than 3 times the number of nickels
That would be;
3(n) -8 = 3n -8
The driving distance from Chicago to San Francisco is 2,142 miles. The Hathaway family left Chicago on Monday morning, December 6. They averaged 50 miles an hour and drove 6 hours each day. On what day and date did they reach San Francisco?
Answer:
They arrive on Monday, December 13th
Step-by-step explanation:
First, we know that this family must drive a total of 2,142 miles.
They average 50 miles per hour and drive 6 hours each day, thus we can see that they drive (50)(6)=300 miles per day.
Now, to know how many days it will take them to drive the total of 2,142 miles we are going to divide the total amount of miles between the number of miles driven per day:
2,142÷300= 7.14
Thus, it takes them 7.14 days to drive 2,142 miles.
If we round this (since the number is greater than 7 this would mean it takes them more than 7 days and they would stop at 7 for the day) to the next digit, we would have that it will take them 8 days to get to San Francisco.
Thus, since they start on December 6th (day 1), December 7th would be day 2 and following this pattern we would have that the eighth day would be December 13th.
Now, since the days repeat every 7 days and we now that December 6th was monday, we would have that the day they arrive to San Francisco (December 13th) is monday too.
Identify the table of values which represents the function y=x+2
Answer:
Option 1.
Step-by-step explanation:
y = x + 2
Put x as 1, 2 and 3 to find y.
y = (1) + 2
y = 3
y = (2) + 2
y = 4
y = (3) + 2
y = 5
When x = 1, y = 3.
When x = 2, y = 4.
When x = 3, y =5.
The values that represent the function is the first table.
Recently, FHA mortgages, which are insured by the federal government, accounted for 28% of all home-purchase mortgages that were approved. A random sample of 150 mortgage applications was selected. What is the probability that 48 or more from this sample were insured by the FHA?
Answer:
15.87% probability that 48 or more from this sample were insured by the FHA
Step-by-step explanation:
I am going to use the normal approximation to the binomial to solve this question.
Binomial probability distribution
Probability of exactly x sucesses on n repeated trials, with p probability.
Can be approximated to a normal distribution, using the expected value and the standard deviation.
The expected value of the binomial distribution is:
[tex]E(X) = np[/tex]
The standard deviation of the binomial distribution is:
[tex]\sqrt{V(X)} = \sqrt{np(1-p)}[/tex]
Normal probability distribution
Problems of normally distributed samples can be solved using the z-score formula.
In a set with mean [tex]\mu[/tex] and standard deviation [tex]\sigma[/tex], the zscore of a measure X is given by:
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
When we are approximating a binomial distribution to a normal one, we have that [tex]\mu = E(X)[/tex], [tex]\sigma = \sqrt{V(X)}[/tex].
In this problem, we have that:
[tex]p = 0.28, n = 150[/tex]
So
[tex]\mu = E(X) = np = 150*0.28 = 42[/tex]
[tex]\sigma = \sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{150*0.28*0.72} = 5.5[/tex]
What is the probability that 48 or more from this sample were insured by the FHA?
Using continuity correction, this is [tex]P(X \geq 48 - 0.5) = P(X \geq 47.5)[/tex], which is 1 subtracted by the pvalue of Z when X = 47.5. So
[tex]Z = \frac{X - \mu}{\sigma}[/tex]
[tex]Z = \frac{47.5 - 42}{5.5}[/tex]
[tex]Z = 1[/tex]
[tex]Z = 1[/tex] has a pvalue of 0.8413.
1 - 0.8413 = 0.1587
15.87% probability that 48 or more from this sample were insured by the FHA
Suppose the price of a pair of shoes, including 14% vat is R240. The price of the pair of shoes is reduced by 15% on sale. What is the reduced price of the shoes including VAT?
Answer:
$204
Step-by-step explanation:
First, you have to find the price without VAT. To calculate it you have to divide the price including VAT by one plus the rate:
Price including VAT= $240
VAT= 14%
240/(1+0.14)= 240/1.14= 210.52
Now, you have to calculate the 15% of 210.52 and subtract that amount from the price:
210.52*0.15=31.57
210.52-31.57=178.95
Then, you have to calculate the 14% VAT by multiplying the price for 1 plus the rate:
178.95*(1+0.14)= 178.95*1.14= 204
According to this, the reduced price of the shoes including VAT is $204.
Use the function rule f(x)=x^2
Find f(2.5)__
Answer:
6.25
Step-by-step explanation:
f(x)=x^2
f(2.5) = (2.5)^2
=6.25
Answer: 6.25
Step-by-step explanation: Notice that f is a function of x.
So we want to find f(2.5).
We find f(2.5) by plugging 2.5 in for x
everywhere that x appears in the function.
So we have f(2.5) = (2.5)².
(2.5)² is 6.25.
So our answer is 6.25.
HELPPP The number of members in the Triathlon Club was 36 in 2001 and has increased by 20% each year. Which exponential growth model shows the club's membership in terms of t, the number of years since 2001? s since 2001?
A. y=20(36)t
B. y=36(0.2)t
C. y=36(1.2)t
D. y=36(20)t
Answer:
C. y=36(1.2)t
Step-by-step explanation:
The number of members in the Club in t years after 2001 is given by an equation in the following format:
[tex]y = y(0)(1+r)^{t}[/tex]
In which y(0) is the number of members in 2001 and r is the growth rate, as a decimal.
The number of members in the Triathlon Club was 36 in 2001 and has increased by 20% each year.
This means that [tex]y(0) = 36, r = 0.2[/tex]
So
[tex]y = y(0)(1+r)^{t}[/tex]
[tex]y = 36(1+0.2)^{t}[/tex]
[tex]y = 36(1.2)^{t}[/tex]
The correct answer is C.
which fraction is equivalent to 5/12+1/4
Answer:
2/3
Step-by-step explanation:
5/12+1/4
Make the fractions have the same denominator.
5/12 + 1×3/4×3
5/12 + 3/12
Add the fractions.
(5+3)/12
8/12
Simplify.
2/3
Answer:
[tex] = \frac{2}{3} \\ [/tex]
Step-by-step explanation:
[tex] \frac{5}{12} + \frac{1}{4} \\ \frac{5 + 1 \times 3}{12} \\ \frac{5 + 3}{12} \\ = \frac{8}{12} \\ = \frac{2}{3} [/tex]
heeeeeeeellllllllllppppppppppppp plz i nned help
Answer:
Step-by-step explanation:
This is a ratio problem. there are 20 Blonde Teachers, and 12 brown haired teachers. The fraction is 12/20. We can simplify this fraction to 3/5. for every 3 brown haired Teacher, there is 5 other blonde hair teachers.
what is a unit rate?
Answer:
5
Step-by-step explanation:
Answer:
the answer is-
Step-by-step explanation:
When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates.
HOPE IT HELPS!!!
Please answer this question !! 20 points and brainliest !! Thank u !!
Answer:
Step-by-step explanation:
The system of equations (a) is the correct one for this situation. We must now solve this system for x and y, which are the unit costs.
Multiplying the 2nd equation by (-3/2) yields -12x - 18y = -168.
Now eliminate x by combining the two equations
12x + 5 y = 116
-12x -18y = - 168
-------------------------
-13y = -52, or y = 4.
If y = 4 then 12x + 5y = 116, or
12x +5(4) = 116, or
12x + 20 = 116, or
12x = 96, or x = 8
Roller pens are $8/dozen and ball point pens are $4 per dozen.
I think it’s A:
Cause it is what it is
Lataycia has 188 but she is spending 14 per week.
Answer:
90
Step-by-step explanation:
14×7=98
188-98=90 so she had 90 left
Answer:
90
Step-by-step explanation:
14×7=98
188-98=90 so she had 90 left
Four different positive integers have a product of 110.
What is the sum of the four integers?
Given:
Four different positive intergers as a product of 110
To find:
The sumnof the four numbers whose product is 110
Solution:
1) To find the number we have to find the prime factorization of the given number 110
2) Prime factorization of 110 is
110 = 1×2 × 5 = 11
3) So the four numbers whose product is 110 are 1,2,5 and 11
4) The sum of number's are
1+2+5+11=19
SO THE FINAL ANSWER IS 19what is the solution of this equation 4(x-8)+10=-10
Start by subtracting 10 from both sides.
This gives us 4x - 32 = -20.
Now add 32 to both sides to get 4x = 12.
Now divide both sides by 3 to get x = 3.
Lines f and g are perpendicular. The equation of line f is y = 1/4x + 2. What is
the equation of line g?
Answer:
y = -4x + (any number)
Step-by-step explanation:
you want to use the negative reciprocal of the slope for line f
so m = -4, since you didn't say any points it has to go through then the
equation of the line is y = -4x + (any number)
Answer:
-4× - 4 That is the answer
5 Samir wants to work out the cost of the tiles needed to replace a roof.
The roof has 4 identical faces.
Each face is a triangle.
Each triangle has a base length of 7.6 m and a height of 4.8 m.
Samir has this information,
roof tiles
1 pack of tiles covers 13.8 m² (including overlaps)
each pack costs £716.10
Answer:
Step-by-step explanation:
Since the roof has 4 identical faces and each face is a triangle, we would determine the area of each face of the triangle by applying the formula,
Area of triangle = 1/2 × base × height
Area of each triangular face = 1/2 × 7.6 × 4.8 = 18.24m²
Area of the 4 faces = 4 × 18.24 = 72.96 m²
Since 1 pack of tiles covers 13.8 m², the number of packs needed to cover 72.96 m² is
72.96/13.8 = 5.29 packs
Since samir can only buy whole packs of these tiles, the number of packs of tiles that he needs to buy would be 6.
If 1 pack costs £716.1, then the total cost of the tiles needed for the 4 faces of this roof is
6 × 716.1 = £4296.6
A university found that 20% of its students withdraw without completing the introductory statistics course. Assume that 20 students registered for the course. (a) Compute the probability that 2 or fewer will withdraw. If required, round your answer to four decimal places. (b) Compute the probability that exactly 4 will withdraw. If required, round your answer to four decimal places. (c) Compute the probability that more than 3 will withdraw. If required, round your answer to four decimal places. (d) Compute the expected number of withdrawals.
Answer:
a) 0.206 = 20.6% probability that 2 or fewer will withdraw.
b) 0.2182 = 21.82% probability that exactly 4 will withdraw.
c) 0.5886 = 58.86% probability that more than 3 will withdraw.
d) The expected number of withdrawals is 4.
Step-by-step explanation:
For each student, there are only two possible outcomes. Either they withdraw without completing the introductory statistics course, or they do not. Each student is independent of each other. So we use the binomial probability distribution to solve this question.
Binomial probability distribution
The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.
[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]
In which [tex]C_{n,x}[/tex] is the number of different combinations of x objects from a set of n elements, given by the following formula.
[tex]C_{n,x} = \frac{n!}{x!(n-x)!}[/tex]
And p is the probability of X happening.
20% of its students withdraw without completing the introductory statistics course.
This means that [tex]p = 0.2[/tex]
Assume that 20 students registered for the course.
This means that [tex]n = 20[/tex]
(a) Compute the probability that 2 or fewer will withdraw.
[tex]P(X \leq 2) = P(X = 0) + P(X = 1) + P(X = 2)[/tex]
[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]
[tex]P(X = 0) = C_{20,0}.(0.2)^{0}.(0.8)^{20} = 0.0115[/tex]
[tex]P(X = 1) = C_{20,1}.(0.2)^{1}.(0.8)^{19} = 0.0576[/tex]
[tex]P(X = 2) = C_{20,2}.(0.2)^{2}.(0.8)^{18} = 0.1369[/tex]
[tex]P(X \leq 2) = P(X = 0) + P(X = 1) + P(X = 2) = 0.0115 + 0.0576 + 0.1369 = 0.206[/tex]
0.206 = 20.6% probability that 2 or fewer will withdraw.
(b) Compute the probability that exactly 4 will withdraw.
[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]
[tex]P(X = 4) = C_{20,4}.(0.2)^{4}.(0.8)^{16} = 0.2182[/tex]
0.2182 = 21.82% probability that exactly 4 will withdraw.
(c) Compute the probability that more than 3 will withdraw.
Either less than 3 withdraw, or more than 3 withdraw. The sum of the probabilities of these events is 1. So
[tex]P(X \leq 3) + P(X > 3) = 1[/tex]
We want P(X > 3). So
[tex]P(X > 3) = 1 - P(X \leq 3)[/tex]
In which
[tex]P(X \leq 3) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3)[/tex]
[tex]P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}[/tex]
[tex]P(X = 0) = C_{20,0}.(0.2)^{0}.(0.8)^{20} = 0.0115[/tex]
[tex]P(X = 1) = C_{20,1}.(0.2)^{1}.(0.8)^{19} = 0.0576[/tex]
[tex]P(X = 2) = C_{20,2}.(0.2)^{2}.(0.8)^{18} = 0.1369[/tex]
[tex]P(X = 3) = C_{20,3}.(0.2)^{3}.(0.8)^{17} = 0.2054[/tex]
[tex]P(X \leq 3) = P(X = 0) + P(X = 1) + P(X = 2) + P(X = 3) = 0.0115 + 0.0576 + 0.1369 + 0.2054 = 0.4114[/tex]
[tex]P(X > 3) = 1 - P(X \leq 3) = 1 - 0.4114 = 0.5886[/tex]
0.5886 = 58.86% probability that more than 3 will withdraw.
(d) Compute the expected number of withdrawals.
The expected value of the binomial distribution is:
E(X) = np
In this question:
E(X) = 20*0.2 = 4
The expected number of withdrawals is 4.
Please answer this correctly
Answer: A ≈ 3.25 in squared
Step-by-step explanation:
So we can work backward using the perimeter of a circle formula to find the radius.
Perimeter of a whole circle: C = 2* 3.14 * r
Since we are only given a quarter of the perimeter we need to multiply the 3.57 by 4 to find C.
C = 14.28
Now we can solve for r using algebra.
[tex]14.28 = 2 *3.14*r[/tex]
Multiply 2 and 3.14
[tex]14.28 = 6.28*r[/tex]
Isolate r through division.
[tex]2.2739 =r\\[/tex]
Now that we have the radius of the circle we can plug that into the area of a circle.
Formula: [tex]A = 3.14* r^2[/tex]
Plug in and solve.
[tex]A = 3.14 * 2.2738^2[/tex]
A = 16.2355 in squared
This however is the area of the whole circle it is just looking for a quarter.
So we can divide the area of the whole circle by 4 to find the final answer.
16.2355 / 4 = 3.2471
Now round to the nearest hundreds which is the second number after the decimal.
A ≈ 3.25
Solve the system of equations. 3x + 4y = 8 x + 2y = 4
Answer:
x=0, y=2
Step-by-step explanation:
3x+4y=8
x+2y=4
Multiply the second equation by 2:
2x+4y=8
Subract it from the first equation:
x=0
y=2
Hope this helps!
What’s the correct answer for this?
Answer:
The answer is option 2.
Step-by-step explanation:
Given that the formula for length of arc is :
[tex]arc = \frac{θ}{360} \times 2 \times \pi \times r[/tex]
Answer:
B
Step-by-step explanation:
It could also be
[tex] \frac{\pi \times r \times m}{180} [/tex]
find a in a=6b if b=2
Answer:
a=12
Step-by-step explanation:
if a=6b
and b=2
a=2×6
a=12
Annie was told that her math test score was 3 standard deviations below the mean. If test scores were approximately normal with μ=99 and σ=4, what was Annie's score? Do not include units in your answer. For example, if you found that the score was 99 points, you would enter 99.
Answer:
[tex]X \sim N(99,4)[/tex]
Where [tex]\mu=99[/tex] and [tex]\sigma=4[/tex]
We want to find the Annie's score takign in count that the score is 3 deviations below the mean, so then we can find the value with this formula:
[tex] X = \mu -3\sigma[/tex]
And replacing we got:
[tex] X = 99 -3*4 = 87[/tex]
So then the Annie's score would be 87
Step-by-step explanation:
Let X the random variable that represent the test scores of a population, and for this case we know the distribution for X is given by:
[tex]X \sim N(99,4)[/tex]
Where [tex]\mu=99[/tex] and [tex]\sigma=4[/tex]
We want to find the Annie's score takign in count that the score is 3 deviations below the mean, so then we can find the value with this formula:
[tex] X = \mu -3\sigma[/tex]
And replacing we got:
[tex] X = 99 -3*4 = 87[/tex]
So then the Annie's score would be 87
Answer: 87
Step-by-step explanation:
We can work backwards using the z-score formula to find the x-value. The problem gives us the values for z, μ and σ. So, let's substitute these numbers back into the formula:
z−3−1287=x−μσ=x−994=x−99=x
We can think of this conceptually as well. We know that the z-score is −3, which tells us that x is three standard deviations to the left of the mean, 99. So we can think of the distance between 99 and the x-value as (3)(4)=12. So Annie's score is 99−12=87.
The AARP (American Association of Retired People) report that at least 60% of retired people under the age of 65 would return to work on a full-time basis if a suitable job were available. A sample of 500 retirees under the age of 65 showed that 315 would return to work. Can we conclude that more than 60% would return to work? Test at the 2% level of significance.
Answer:
Step-by-step explanation:
Proportion of retired people under the age of 65 would return to work on a full-time basis if a suitable job were available = 60/100 = 0.6 = P
Null hypothesis: P ≤ 0.6
Alternative: P > 0.6
First, to calculate the hypothesis test, lets workout the standard deviation
SD = √[ P x ( 1 - P ) / n ]
where P = 0.6, 1 - P = 0.4, n = 500
SD = √[ (0.6 x 0.4) / 500]
SD = √ (0.24 / 500)
SD = √0.00048
SD = 0.022
To calculate for the test statistic, we have:
z = (p - P) / σ where p = 315/500 = 0.63, P = 0.6, σ = 0.022
z = (0.63 - 0.6) / 0.022
z = 0.03/0.022
z = 1.36
At the 2% level of significance, the p value is less than 98% confidence level, thus we reject the null hypothesis and conclude that more than 60% would return to work.
A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is known that the standard deviation of the contents (i.e., of the population) is 0.22 ounces. The point estimate of the mean content of the bottles is:__________.
Select one:
a. 0.02
b. 0.22
c. 121
d. 4
Answer:
option D is correct, 4 ounces.
Step-by-step explanation:
In this case we have a random sample of 121 cologne bottles that showed an average content of 4 ounces.
The point estimate of the mean content of the bottles is average value.
What 4 ounces means is the correct answer since this is the mean, therefore the option D is correct
Solve the equation for the indicated variable.
660w
C=
for w
h2
W=
(Simplify your answer.)
The first step is to multiply both sides by h^2. Afterwards, divide both sides by 660 to fully isolate w.
c = 660w/(h^2)
ch^2 = 660w
660w = ch^2
w = (ch^2)/660 is the answer
A store that sells skis buys them from a manufacturer at a wholesale price of $87 The store's markup rate is 50% A. What price does the store charge its customers for the skis? B. What percent of the original price is the final price? C. What is the percent INCREASE from the original price to the final price?
Answer:
A. $130.50
B. 150%
C. 50%
Step-by-step explanation:
First, find 50% of 87 and add it to find the new price.
87 x 0.5 = 43.5
87 + 43.5 = 130.5
Then, find the percent by doing 130.5 ÷ 87, which is 150%
Calculate the percent increase by doing (130.5-87) ÷ 87, which is 50%
Answer:
see below
Step-by-step explanation:
First find the markup
87* 50%
87*.50
43.50
Add this to the wholesale price
87+43.50 =130.50
This is what they charge the customer
This is 150% percent of the wholesale price
100% + 50% = 150%
To find the percent increase
Take the new price and subtract the wholesale price
Then divide by the wholesale price
(130.50-87)/87 =50 % increase
