Standard deviation of the delivery times of all pizzas

Reference no: EM1386228

A customer wants to estimate the average delivery time of a pizza from the local pizza parlor. The customer wants to obtain a sample mean that falls within 3.204 minutes of the true average delivery time with 99% confidence. If the customer knows the standard deviation of the delivery times of all pizzas is 9.646, how many pizzas will need to be ordered?

1) We do not have enough information to answer this question since we were not given the sample mean.

2) 71

3) 66

4) 60

5) 61

Reference no: EM1386228

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