1-40, 6.053) In the Ardmore Hotel, 20 percent of the customers pay by American Express credit card. (a) Of the next 10 customers, what is the probability that none pay by American Express? BALL (b) Of the next 10 customers, what is the probability that at least two customers pay by American Express? CHORHBALI CHORH (c) Of the next 10 customers, what is the probability that fewer than three customers pay by American Express? ESAL2020 HAFSAL (d) what is the expected number who pay by American Express? TABLE 6.7 Parameters n = number of trials Binomial Distribution 7 = probability of success PDF P(X = x) =. n! TT (1 - 7)0- x x!(n - x)! CHORH Excel* PDF =BINOM.DIST(x, n, 7, 0) HAFSAL Excel* CDF =BINOM.DIST(x, n, 7, 1) Domain x = 0, 1, 2, . . . .n Mean NTT Standard deviation Vnm(1 - 7) CHORH Random data =BINOM.INV(n, TT, RANDO) generation in Excel or use Excel's Data Analysis Tools HAFSAL Comments Skewed right if 7 .50, and symmetric if 7 = .50. *Excel 2010's new function =BINOM.DIST(x, n, 7, cumulative) gives the same result as the previous function =BINOMDIST(x, n, 5, cumulative). This new function will not work in previous versions of Excel, but the old functions work in all versions of Excel as of the publication date of this textbook. CHORH AFSALA ESALCY ESALLY ESALLY AFSAL