4 At the School fête, few people have entered any of the 24 meat raffles, so to support the school, Larry buys 8 of the 20 tickets in each raffle. a Calculate the expected value and standard deviation for the random variable of the number of Larry's wins. b If Larry wins 6 raffles, calculate how many standard deviations Larry's result is below the mean, as a measure of his poor luck.
4 At the School fête, few people have entered any of the 24 meat raffles, so to support the school, Larry buys 8 of the 20 tickets in each raffle. a Calculate the expected value and standard deviation for the random variable of the number of Larry's wins. b If Larry wins 6 raffles, calculate how many standard deviations Larry's result is below the mean, as a measure of his poor luck.
Chapter8: Sequences, Series,and Probability
Section8.7: Probability
Problem 11ECP: A manufacturer has determined that a machine averages one faulty unit for every 500 it produces....
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Transcribed Image Text:4 At the School fête, few people have entered any of the 24 meat raffles, so to support the school, Larry
buys 8 of the 20 tickets in each raffle.
a Calculate the expected value and standard deviation for the random variable of the number of Larry's
wins.
b If Larry wins 6 raffles, calculate how many standard deviations Larry's result is below the mean, as a
measure of his poor luck.
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