Twenty-one car salespeople were sampled to see how many cars they sold in a month; the following data was obtained: 20, 23, 35, 29, 24, 26, 25, 22, 24, 22, 23, 17, 29, 25, 24, 19, 31, 29, 27, 28, 23 Assuming the population standard deviation is o = 4, construct a 91% confidence interval for the mean number of cars sold per month by the population of car salespeople. D = 2 = Margin of Error: E = We are 91% confident that, on average, car salespeople sell between cars and cars per month. Question Help: D Post to forum