Question 189783: 60 % of the customers of a fast food chain order the super hamburger, french fries and a drink. If a random sample of 15 cash register receipts is selected, what is the probability that 10 or more will show that the above three food items were ordered? What is the expected value of the distribution? What is the variance of the distribution?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 60 % of the customers of a fast food chain order the super hamburger, french fries and a drink. If a random sample of 15 cash register receipts is selected, what is the probability that 10 or more will show that the above three food items were ordered? What is the expected value of the distribution? What is the variance of the distribution?
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It's a binomial problem with n=15 ; p = 0.6 ; 10 <= x <= 15
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P(10<=x<=15) = 1 - binomcdf(15,0.6,9) = 0.4032
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Cheers,
Stan H.
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