7. The following data shows the number of businesses visited by a random sample of 35 salespeople in one month: 33 44 34 46 48 40 37 32 39 42 41 36 35 37 45 44 30 40 40 48 44 48 30 33 34 46 34 38 46 37 42 36 36 36 39 Estimate a 95% confidence interval of the population mean number of businesses visited by a salesperson over the course of one month, assume that = 40 6