Answer:
The probability that the bulb will last more than 1,200 hours is 0.3012
Step-by-step explanation:
Let the random variable <em>X</em> = life of a light bulb .
The random variable
The probability distribution function of exponential distribution is:
The mean of the distribution is, Mean = 1000 hours.
The value of λ is:
Compute the probability that the bulb will last more than 1,200 hours as follows:
Thus, the probability that the bulb will last more than 1,200 hours is 0.3012.