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The time it takes to completely tune an engine of an automobile follows an exponential distribution...

The time it takes to completely tune an engine of an automobile follows an exponential distribution with a mean of 48 minutes. (Total: 4 marks; 2 marks each)
a. What is the probability of tuning an engine in 36 minutes or less?
b. What is the probability of tuning an engine between 24 and 36 minutes?
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