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

27

with a standard deviation of

7

days. Assume the data to be approximately bell-shaped.

(a) Estimate the percentage of bills for which payment was made in greater than 34 days

Approximately ___ of the bills have payments greater than 34%

.