Average sales for an online textbook distributor were $66.73 per

customer per purchase. Assume the sales are normally distributed. If the standard deviation of the amount spent on textbooks is$
9.89
, find these probabilities for a randomly selected customer of the online textbook distributor. Round your answer to the nearest tenth of a percent.(a)He or she spent more than $
96.4
per purchase.
(b)He or she spent less than $
86.51
per purchase.
Refer to the table of values (Area Under the Standard Normal Distribution) as needed.

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