Asked by ash

The life of automobile voltage regulators has an exponential distribution with a mean life of six years. You purchase an automobile that is six years old, with a working voltage regulator and plan to own it for three years.
a)What is the probability that the voltage regulator fails during your ownership?
Answered by bobpursley
Pr(x>9)=.223
Pr(fails)=.5-.223
Answered by ash
So the number of fails is 4.777? How id you get .5?
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