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 31 with a standard deviation of 3 days. Assume the data to be approximately bell-shaped. Part 1 of 3 (a) Between what two values will approximately 95% of the numbers of days be? Approximately 95% of the customer accounts have payment made between |25 and 37 days. Part: 1 / 3 Part 2 of 3 (b) Estimate the percentage of customer accounts for which the number of days is between 28 and 34. X (Choose one) of the customer accounts have payment made between 28 and 34 days