John works at a bakery in New York City. He is the only employee who makes chocolate

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Question:

• John works at a bakery in New York City. He is the only employee who makes chocolate cakes (and he only needs to make the cakes). On average, it takes him 30 minutes to make a cake. The average number of chocolate cakes requested by customers in a day is 10 units, and the bakery operates 10 hours each day.

. Based on a survey, 95% of the customers can get their chocolate cakes within 35

minutes after they place the order. Assume that John's processing time follows a

normal distribution. What is the standard deviation of the processing time?

A. 3.04

B. 3.27

C. 3.51

D. 3.83