Question

Help with some normal distribution problems?

Answer 1

The time required to finish a test is normally distributed with a mean of 60 minutes and a standard deviation of 10 minutes. What is the probability that a student will finish the test in less than 70 minutes?

Answer 2

Do you have a normal distribution chart in front of you?

Answer 3

yes

Answer 4

So 60 is going to be that center little bit, excuse my terrible drawing.

Answer 5

A standard deviations is another line. Like this (but your graph is neater). Since each of the standard deviations is 10, All you care about is The line right after the mean and before.