The life of a light bulb is exponentially distributed with a mean of 1,000 hours.What is the probability that the bulb will last: More than 1,200 hours?
A).3012
B).3679
C).4345
D).6988

Question

Quizplus · Accepted Answer

The probability that the bulb will last more than 1,200 hours is given by the integral of the exponential distribution from 1,200 to infinity. This integral is equal to e^(-1200/1000) = 0.3012.

The Life of a Light Bulb Is Exponentially Distributed with a Mean