The distribution of the number of viewers for the American Idol television show follows a normal distribution with a mean of 27 million and a standard deviation of 10 million.

Question

A: Have between 29 and 37 million viewers?

B: Have at least 21 million viewers?

C: Exceed 43 million viewers?

Answer 1

You can play around with Z table stuff here:

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