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 30 with a standard deviation of 3 days. Assume the data to be approximately bell-shaped.
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(a) Estimate the percentage of bills for which payment was made in greater than 36 days.
Approximately

% of the bills have payments made in greater than 36.