At a supermarket the amount spent by a shopper during a single shopping trip follow a normal distribution with a mean of $72 and a standard deviation of $34.

as the manager, you have decided to award double coupons to your best customers.

if you wish to limit double coupons to one-fifth of your customers, what minimum amount must a customer spend during a visit?

a. 100.56 b. 43.44 c. 54.32 d. 89.68