Normal Probability Curve

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

• 60

• 1010

• 20

• 40

The lengths of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. What percent of pregnancies will last fewer than 8 months (approximately 240 days)?

• 13.14%

• 96.9%

• 86.86%

• 3.10%

What percentage of females are between 5'3.5" and 5'6.5"?

• 81.5%

• 68%

• 16%

• 95%

The data is _____ standard deviation(s) from the mean.

• 2

• 1

• 3

The graph of a Normal distribution is _________ to the x axis.

What is P ( X < 70 )?

• 95.15%

• 94.84%

• 95.35%

• 95.25%

What proportion of the standard normal curve falls above a z-score of 1.33?

• 0.9082

• 0.0918

• 0.1093

• 0.8907

Find the area under the standard normal curve to the right of z = -2.67.

• 0.0869

• 0.9962

• 0.0008

• 0.1234

Find the area under the normal distribution curve between a z= -1.26 and z= 0.57.

• 0.0047

• 0.9204

• 0.6119

• 0.4981

Find the area under the normal distribution curve to the left of

Z = 0.27.

• 0.3936

• 0.3897

• 0.6064

• 0.4892