Normal Probability Distributions

Given a mean of 75 and a standard deviation of 7, what percentage of scores are above 82?

(You may need to draw and label a normal curve.)

• 34%

• 81.5%

• 16%

• 2.5%

The distribution of heights of adult American men is approximately Normal with mean 69 inches and standard deviation 2.5 inches. What percent of men are between 64 and 66.5 inches tall? 

(You may need to draw and label a normal curve.)

• 50%

• 2.5%

• 13.5%

• 34%

What is the the total probability under the normal distribution curve?

• 10%

• 25%

• .5%

• 100%

The normal curve is symmetrical about the mean.

• True

• False

What is the standard deviation of this distribution? (how far is it from the mean to the first stdev line?)

• 60

• 1010

• 20

• 40

According to the normal distribution, what percent of the population has an IQ between 70 -115

• 68%

• 81.5%

• 95%

• 47%

Which best describes the shaded part of the standard normal distribution graph?

• All data that is one or higher

• All data that is between 1 and 3

• All data that is one or more standard deviations above the mean

• All data that is above the mean

The normal distribution curves represents U.S. female heights. What percentage of females are between 5'6.5" and 5'11"?

• 68%

• 95%

• 16%

• 81%

The shelf life of a particular dairy product is normally distributed with a mean of 12 days and a standard deviation of 3 days.

About what percent of the products last between 12 and 15 days?

• 68%

• 34%

• 16%

• 2.5%

What is the probability that a score is under (left of) -.37?

• .6443

• .3974

• .3557

• .3156