Question

The weights of the 100 students in an introductory statistics class are normally distributed, with a mean of 170 pounds and a standard deviation of 5 pounds.

How many students would you expect to have weight between 162 pounds and 178 pounds?

What is the probability that a student picked at random weighs less than 165 pounds?

Answer 1

great stats calculator, just fill in the values

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

Answer 2

Thanks Reiny. That really help.