The distance between major cracks in a highway follows an exponential

The distance between major cracks in a highway follows an exponential distribution with mean of four miles.

A) What is the probability that there are no major cracks in a 12-mile stretch of the highway?

B) What is the probability that there are three major cracks in a 12-mile stretch of the highway?

C) What is the standard deviation of the distance between major cracks?

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