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4. The time it takes to completely tune an engine of an automobile Y follows an...

4. The time it takes to completely tune an engine of an automobile Y follows an exponential distribution with a mean of 45 minutes. Please answer the following questions.

(a) What is the probability of tuning an engine in 30 minutes or less?

(b) What is the probability of tuning an engine between 30 and 60 minutes?

(c) What is the standard deviation of the variable Z?

math   Statistics-And-Probability   
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