% of batteries that has life span that is more than 2065 hr

The life span of a battery is normally distributed, with a meanof 2000 hours and a standard deviationof 30 hours. What percent of batteries have a life span that is more than 2065 hours?

1. 3%
2. 2.6%
3. 1%
4. 1.5%

Using the z formula:

z = (x-mean)/standard deviation

Given mean= …

A step by step solution to the problem is provided.