Question

The life span of a calculator has a normal distribution with a mean of 60 months and a standard deviation of 5 months. If a calculator is randomly selected, find the probability that the calculator has a life span of.
(1) more than 50 months
(2) between 4 years and 6 years.

Answer 1

http://davidmlane.com/hyperstat/z_table.html

Answer 2

Using a TI-84 calculator, find the area under the standard normal curve to the right of the following -values. Round the answers to four decimal places.
Part 1 of 4
The area to the right of is


.
Part 2 of 4
The area to the right of is

.
Part 3 of 4
The area to the right of is