1. The time that it takes for a restaurant to make a order is normally distributed with = 15 and = 7 minutes. Suppose that the restaurant serves 80 customers during lunch one day. Let x be the mean time that it takes to prepare these 80 orders. What is the distribution of x?

a) N(15, 7)

b) N(1.68, 0.783)

c) N(15, 0.783)

d) N(1.68, 7)