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Question

Suppose the machine that seals the cereal boxes operates for an average of 13 days before it breaks down. Assume

the machine has just been serviced and is in good running order and that the timing of breakdowns follows an exponential distribution.


1) What is the probability that the machine works for 13 days before it breaks down?

A. 0.50

B. 0.63

C. 0.71

D. 0.84


2) What is the probability that the machine will operate longer than 20 days?

A. 0.05

B. 0.13

C. 0.18

D. 0.21

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