Question

The lifetime of a light bulb in a certain application is normally distributed with mean = 1000 hours and a standard deviation = 100 hours.


A) What is the probability that a lightbulb will last more than 1100 hours?

B) Find the 10th percentile of the lifetimes

C) What is the probability that the lifetime of a light bulb is between 900 and 1100 hours?

Answer 1

A. Probability that lightbulb will last more than 1100 hours is 0.1581

B. 10th percentile of lifetime of bulb is 870

C. Probability that the lifetime of a lightbulb is between 900 and 1100 hours is 0.6838

complete solution is given in attached images:

Thank You.