Pay your bills: In a large sample of customer accounts, a utility company determined that the average number of days between when a bill was sent out and when the payment was made is 29 with a standard deviation of 5 days. Assume the data to be approximately bell-shaped. Part: 0 / 3 Part 1 of 3 (a) Estimate the percentage of bills for which payment was made in greater than 39 days. Approximately % of the bills have payments made in greater than 39