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Between 11 p m and midnight on Thursday night Mystery Pizza

Between 11 p.m. and midnight on Thursday night, Mystery Pizza gets an average of 4.2 telephone orders per hour.

(a) Find the median waiting time until the next telephone order.

(b) Find the upper quartile of waiting time before the next telephone order.

(c) What is the upper 10 percent of waiting time until the next telephone order? Show all calculations clearly.

(a) Find the median waiting time until the next telephone order.

(b) Find the upper quartile of waiting time before the next telephone order.

(c) What is the upper 10 percent of waiting time until the next telephone order? Show all calculations clearly.

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