What is the probability of tuning an engine in 20 minutes


The time it takes to completely tune an engine of an automobile Y follows an exponential distribution with a mean of 40 minutes. Please answer the following questions.

(a) What is the probability of tuning an engine in 20 minutes or less?

(b) What is the probability of tuning an engine between 20 and 50 minutes?

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

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