Finding Percents (normal dist)

What shape is a normal distribution curve?

• Half curve
• Round curve
• Bell curve
• Square curve

What is the total area under the normal curve in a standard normal distribution?

• 1

• 2

• 3

• 4

Where can we locate the mean in the normal curve?

• to the left portion

• to the right portion

• at the center

• on the z - axis

A z-score tells you...

• the standard deviation of a sampling distribution.
• the original raw score on which it is based.
• if the distribution it comes from is normal.
• how many standard deviations away from the mean a score lies.

Find the area under the normal distribution curve that represents the area to the left of:

z = -2.37

• 0.0089

• 0.9910

• 0.1401

• 0.1381

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:

z = -1.53 and z = 0.

• 0.437

• 0.563

• 0.500

• 0.063

The 40 yards sprint times for a soccer team are found to be normally distributed with a mean of 5.2 seconds and a standard deviation of 0.3 seconds.  What is the z-score for a player who runs a time of 5.6 seconds?

• -1.33
• 1.33
• 0.88
• 1.02

The mean number of accidents a week at a company is 6.4 with a standard deviation of 1.5. What proportion of weeks would you expect to have less than 5 accidents?

• 0.6915

• 0.1762

• 0.8238

• -0.93

The mean number of accidents a week at a company is 6.4 with a standard deviation of 1.5.  What proportion of weeks would you expect to have more than 7 accidents?

• 0.3446
• 0.2856
• 0.4
• 0.6554