Answer:
The expected value for the number of times Todd attends a concert during a month is 0.5.
Step-by-step explanation:
We have these following probabilities:
5% probability of attending a concert twice a month, which means that P(X = 2) = 0.05
40% probability of attending a concert once a month, which means that P(X = 1) = 0.4
55% probability of not attending a concert during the month, which means that P(X = 0) = 0.55
What is the expected value for the number of times Todd attends a concert during a month?
We multiply each value by its probability. So
[tex]E(X) = 0.05*2 + 0.4*1 + 0.55*0 = 0.1 + 0.4 = 0.5[/tex]
The expected value for the number of times Todd attends a concert during a month is 0.5.
A reading society allows its members to request books, then pick up their books at the library or have them
delivered to their home. Here is the historical data for number of books per year for members who choose each
option.
Answer:
The shape cannot be determined since we don't know the shape of either population distribution.
Step-by-step explanation:
Answer on Khan
If∠=2−25&∠=95−,find.
Answer:
Alternate interior angles have the same measure. As we know that 'angle 1 ' and 50° are alternate interior angles hence they must be equal. Also we now that sum of all the angles of a triangle is equal to 180°. Hence, m∠2=15°.
The base of a triangle is 3 and the height is 2 what is the area ?
Find a.
Round to the nearest tenth:
27 cm
1020
280
a
a = [ ? ]cm
Step-by-step explanation:
I got 56.25 my bad if it's wrong tho
PLEASE HELPPP ILL GIVE BRAINLYIST IF SOMEONE HELPS!
Answer:
7
Step-by-step explanation:
area of parallelogram = l* h
91 = 13 * h
91/13 = h = 7 cm
Answer:
I believe it is 7
Step-by-step explanation:
area is length times width, so if you do opposite equations, and divide 91 by 13, that will be your answer. 7.
A rectangular prism is 4 cm long, 3 cm wide and 8 cm tall. What is the volume of the prism?
Answer:
96 cm³
Step-by-step explanation:
v = 4 x 3 x 8 = 96 cm³
Answer:
The volume of the prism is 96cm^3
Step-by-step explanation:
You multpily 4*3*8=96
Explain how to evaluate 3 to the fourth power
Answer:
3 to the fourth power would basically mean 3 x 3 x 3 x 3
Step-by-step explanation:
Alot of people get this confused with 3 x 4 but when multuply to the power of four its 3 x 3 x 3 x 3 which is 81
Brainliest?
PLEASE HELP
The weight of a soccer ball is normally distributed with a mean of 0.43 kg and a standard deviation of 0.01 kg. Suppose 800 different soccer balls are in a warehouse. About how many soccer balls weigh more than 0.45 kg?
A. 12
B. 20
C. 24
D. 40
Answer:
Answer is b) 20.
Step-by-step explanation:
Mean is 0.43 kg.
0.43+0.1+0.1= 0.45
0.45 is two standard deviation above.
All that are below mean is 50%,
Two standard deviation above is 95%/2=47.5%
50%+47.5% =97.7% are balls that are less than 0.45 kg.
100%-97.7%=2.5% balls that are more than 0.45 kg
2.3%=0.025
800*0.025 = 20 soccer balls weigh more than 0.45 kg
Please take your time.
Answer:
4
Step-by-step explanation:
12+8 = 20
20/5 = 4
solve the system using substitution x=-4y y=2x+9
Answer: x=-4
Step-by-step explanation:
Given
x=-4y
y=2x+9
Rephrase equation to find y value in terms of x
y=-x/4
y=2x+9
Use substitution (substitute value of y)
2x+9=-x/4
Multiply -4 on both sides
-4(2x+9)=-4(-x/4)
-8x-36=x
Add 8x on both sides
-8x-36+8x=x+8x
-36=9x
Divide 9 on both sides
-36/9=9x/9
x=-4
Hope this helps!! :)
Please let me know if you have any questions
j is 14 less than 2 solve for j
Answer:
-12
Step-by-step explanation:
J = 2-14
J = -12
Answer:
-12is the answer
Step-by-step explanation:
j=2-14
j= -12
please help me
is important
Answer:
1, 2, 3, 1
Step-by-step explanation:
In a line plot, the results are lined up, in order. The number of dots above a number correlates to how many times that result, number was the result.
Just count how many times that number appears. Also see if you can simply ant fractions.
hamster runs in its wheel whose r=3. The wheel completes 9.2 rev/sec.what is the linear velocity
The linear velocity of the hamster is 173.328 m/s.
What is linear velocity?Linear velocity is the rate of change of displacement along a straight line.
To calculate the linear velocity of the hamster, we use the formula below.
Formula:
v = ωr............ Equation 1Where:
v = linear velocityr = radius of the wheelω = Angular velocityFrom the question,
Given:
r = 3 mω = 9.2 rev/sec = (9.2×2π) rad/s = 57.776 rad/sSubstitute these values into equation 1
v = 3(57.776)v = 173.328 m/sHence, The linear velocity of the hamster is 173.328 m/s.
Learn more about linear velocity here: https://brainly.com/question/25330477
Answer: 21.7 inches per second
Step-by-step explanation:
Find the conjugate and product of the following surds
2i + 9
Answer:
The conjugate of 2i + 9 = -2i + 9
Product of (2i+9) and (2i+9) is 36i + 77
Step-by-step explanation:
Given - 2i + 9
To find - Find the conjugate and product of the following surds
Proof -
We know that,
The sum and difference of two simple quadratic surds are said to be conjugate surds to each other.
To find a complex conjugate, simply change the sign of the imaginary part (the part with the i ).
So,
The conjugate of 2i + 9 = -2i + 9
Now,
Product of surd (2i+9) is
(2i+9)(2i+9) = 2i(2i) + 2i(9) + 9(2i) + 9(9)
= 4i² + 18i + 18i + 81
= -4 + 36i + 81 { because i² = -1 }
= 77 + 36i
⇒Product of (2i+9) and (2i+9) is 36i + 77
A boat is 170 inches long. A truck is 80% longer than the truck.How long is the truck?
250 inches
213 inches
306 inches
136 inches
15 points <33
Answer:
306 inches
Step-by-step explanation:
80% = 0.8
170 inches × 80% = 170 × 0.8 = 136
The truck is 80% longer than the boat. 80% of the boat is 136.
So, the boat is 170 inches + 136 inches = 306 inches.
Answer:
C) 136 inches.
Step-by-step explanation:
To find this just do the equation:
170 x 0.8 = ?
This equation tells use how much 80% of 170 is. Also, before doing an equation like this, change the percentage into a decimal like 80% to 0.8.
So,
170 x 0.8 = 136
170 + 136 = 306
So the boat is 306 inches.
yuri completed a race in 0.88 fewer seconds than Josie. Josie's time was 23.95 seconds. How l9ng did it takes Yuri to complete the race?
I need help over here
Answer:
The area consists of 3 semi-circles and a square
A) A = 3*1/2πr² + a²
A = 3/2*3.14*(10/2)² + 10² = 217.75 m²B)
A = 3/2*22/7*5² + 10² = 217.85 m²C)
217.75*8 = $1742Please someone help! Will give brainiest! Struggling to understand!
Answer:
Part AInitial population = x, Population after 5 years = 3542Decrease rate = 8.4%Required formula:
x*(1 - 0.084)^5 = 3542x*0.6448 = 3542x = 3542/0.6448x = 5493Part BThe equation is:
E(t) = 5493*0.916^t, where E(t)- population of elk after t years Part C3000 = 5493*0.916^t0.916^t = 3000/54930.916^t = 0.5461log 0.916^t = log 0.5461t = log 0.5461 / log 0.916t = 6.9 years (rounded)Which one doesn't belong?
4(x+3)=9
4+3x=9
4*x+12=9
9=12+4x
a certain colony of bacteria begin with one cell and the population doubles every 20 minutes. What was the population of The Colony after 2 hours?
a. 6
b. 12
c. 32
d. 64
The population of The Colony after 2 hours is d. 64
How to determine the population?The given parameters are:
Initial, a = 1
Rate, b = 2 every 20 minutes
An exponential function is represented as:
y = ab^x
So, we have:
y = 1 * 2^x
y = 2^x
There are six 20 minutes in 2 hours.
This means that:
x = 6
So, we have:
y = 2^6
Evaluate
y = 64
Hence, the population of The Colony after 2 hours is d. 64
Read more about exponential functions at
https://brainly.com/question/2456547
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EMERGENCY PLSS SOMEONE HELP ME RN
Plz help me well mark brainliest if correct!
Answer:
correct point b would be the right answer
Answer:
Point B is Ur answer.
Ms. Nailor's daughter received $25
babysitting one week. How much does she
need to earn the second week to average
$30?
Group of answer choices
$27.50
$30
$35
$25
Answer:
B
Step-by-step explanation:
the manager of a large apartment complex knows from experience that 110 units will be occupied if the rent is 350 dollars per month. a merket survey suggests thet, on average, one additional unit will remaon vacant for each 5 dollars increase in rent. similarly, one addiotional unit will be occupied for each 5 dollar decrese in rent. what is the monthly revenue function for the manager
Answer:
Rent = $230 maximizes revenue
Step-by-step explanation: I just know ;)
What is the slope-intercept equation of the line below?
y-intercept = (0, 2)
slope =
11
Answer:
If the slope is 11, and the y-intercept is (0, 2), the answer is: y = 11x + 2.
The picture says the slope is -1/4. The answer to the question in the picture is: y = -1/4x + 2.
Step-by-step explanation:
Slope form is
y = mx + b.
m is the slope.
b is the y value of y intercept.
Which one is the correct answer..pls HELP a answer accurately..
Answer:
c
Step-by-step explanation:
$0.70 is the answer........
(5^{-8})(5^{-10})=(5
−8
)(5
−10
)=
Answer:
1
3814697265625
Decimal Form:
2.62144 ⋅ 10 / 13
Step-by-step explanation:
Brian invests £4900 into his bank account.
He receives 1.5% per year compound
interest.
How much will Brian have after 4 years?
Give your answer to the nearest penny
where appropriate.
Answer:
5200 pound and 68.139/ 69 penny
If the answer proved helpful to you, Please give it a BRAINLIEST.
Thank you EVERYONE, for EVERYTHING!!
Answer:
it is above
Step-by-step explanation:
ok?
Question 1: The National Assessment of Educational Progress (NAEP) is administered annually to 4th, 8th, and 12th graders in the United States. On the math assessment, a score above 275 is considered an indication that a student has the skills to balance a checkbook. In a random sample of 500 young men between the ages of 18 and 20, the mean NAEP math score is 272. Do we have evidence to support the claim that young men nationwide have a mean score below 275
This question is incomplete, the complete question is;
Question 1: The National Assessment of Educational Progress (NAEP) is administered annually to 4th, 8th, and 12th graders in the United States. On the math assessment, a score above 275 is considered an indication that a student has the skills to balance a checkbook. In a random sample of 500 young men between the ages of 18 and 20, the mean NAEP math score is 272 with standard deviation of 78.
Do we have evidence to support the claim that young men nationwide have a mean score below 275. The level of significance is 5%
Answer:
p-value ( 0.2 ) > significance level (0.05 )
Fail to reject H₀ at ∝ = 0.05
Therefore, We do not have enough evidence to conclude that the mean score is less than 275 for young men nationwide.
Step-by-step explanation:
Given the data in the question;
Null hypothesis H₀ : μ = 275
Alternative hypothesis Hₐ : μ < 275
mean x' = 272
standard deviation σ = 78
sample size n = 500
Test Statistics
z = (x'-μ) / (σ /√n )
we substitute
z = (272-275) / (78 /√500 )
z = -3 / 3.488266
z = - 0.86
from table;
p-value = 0.19489 ≈ 0.2
Hence; p-value ( 0.2 ) > significance level (0.05 )
Fail to reject H₀ at ∝ = 0.05
Therefore, We do not have enough evidence to conclude that the mean score is less than 275 for young men nationwide.
At a Marine Corps military base there is a barbershop where the actual output from each chair is 12 haircuts per hour. It operates with an efficiency of 85%. If the base needs to have 650 haircuts a day how many barber chairs should there be if the barber shop is open 10 hours per day
Answer:
Barbers= 5.41= 6 barbers
Step-by-step explanation:
Giving the following formula:
Haircuts per hour= 12
Number of hours= 10
Haircuts needed= 650
First, we need to calculate the number of haircuts each barber can make per day:
Haircuts per barber a day= 12*10= 120 haircuts
Now, the number of barbers needed:
Barbers= total haircuts / haircuts per day
Barbers= 650/120
Barbers= 5.41= 6 barbers
