A restaurant feeds 400 customers per day. On the average 20 percent of the customers order apple pi

Question
A restaurant feeds 400 customers per day. On the average 20 percent of the customers order apple pie.
Give a range for the number of pieces of apple pie ordered on a given day such that you can be 95 percent sure that the actual number will fall in this range. How would you do this if you did not know a 95 percent interval meant 2 standard deviations away?
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