Expected value, variance, and standard deviation of random variables

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Mathematics

Community College of Philadelphia

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Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables Expected value, variance, and standard deviation of random variables

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Question 11 pts The probability that a cellular phone company kiosk sells X number of new phone contracts per day is shown below. Find the mean for this probability distribution. Round it to the nearest tenths. X 4 5 6 8 10 P(X) 0.4 0.3 0.1 0.15 0.05 Question 21 pts The probability that a cellular phone company kiosk sells X number of new phone contracts per day is shown below. Find the variance for this probability distribution. Round it to the nearest hundredths. X 4 5 6 8 10 P(X) 0.4 0.3 0.1 0.15 0.05 Question 31 pts The probability that a cellular phone company kiosk sells X number of new phone contracts per day is shown below. Find the standard deviation for this probability distribution. Round the answer to the nearest hundredths. X 4 5 6 8 10 P(X) 0.4 0.3 0.1 0.15 0.05 Question 41 pts A landscape contractor bids on jobs where he can make $3000 profit. The probability of getting 1, 2, 3, or 4 jobs per month are shown below. Number of jobs 1 2 3 4 Probability 0.2 0.3 0.4 0.1 Find the contractor's profit per month. Question 51 pts If the variance of a random variable is 4, what is the standard deviation? Question 61 pts For a game at the carnival you get to roll a ten-sided die, numbered from 1 to 10. If you roll at least a 3, you win$10. Unfortunately, if you roll anything else, you lose $15. How much money do you expect to make (or lose) per game?
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Explanation & Answer

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Question 11 pts
The probability that a cellular phone company kiosk sells X number of new phone contracts per
day is shown below. Find the mean for this probability distribution. Round it to the nearest
tenths.
X 4 5 6 8
10
P(X) 0.4 0.3 0.1 0.15 0.05

Mean = ∑ 𝑥 ∗ 𝑝(𝑥)
Mean = 4*0.4 + 5*0.3+6*0.1+8*0.15 +10*0.05
Mean = 5.4
Question 21 pts
The probability that a cellular phone company kiosk sells X number of ne...


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