Question

A certain type of light bulb has a failure rate of 2.4%. What is the expected number of failures if 800 light bulbs are tested?

Answer 1

If there is a failure rate of 2.4% that means 2.4 out of every 100 will fail.

Since there are 800 lightbulbs if you mutiply 2.4 by 8 you will get:

19.2