Question

Customers at Fred’s Cafe win a 100 dollar prize if their cashregister receipts show a star on each of the five consecutive days Monday,·· · , Friday in any one week. The cash register is programmed to print stars on arandomly selected 10% of the receipts. If Mark eats at Fred’s onceeach day for four consecutive weeks and the appearance of stars is an independentprocess, what is the standard deviation of X, where X is the number ofdollars won by Mark in the four-week period?

Answer 1

Let p be the probability that a randomly selected receipts will be chosen for star