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.

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