statistics

18. A telemarketer makes six phone calls per hour and is able to make a sale on 30 percent of these contacts. During the next two hours, find: a. The probability of making exactly 4 sales. b. The probability of making no sales. c. The probability of making exactly 2 sales. d. The mean number of sales in the two-hour period. e. The variance and standard deviation in the number of sales during the two-hour period. at from work on a typical