Chapter 11 Review

Find the Z-score.

Mean = 22

Standard Deviation: 3.1

x = 29

• 2.26

• 16.45

• -2.26

• 1.26

A data set has a mean of 290 and a standard deviation of 20. Calculate the z-score for 265.

• $z=250.5$

• $z=1.25$

• $z=-1.02$

• $z=-1.25$

Steve took his math test and scored an 88. If the class average was a 78 with a standard deviation of 5, what percent of students earned a grade that was higher than Steve's grade?

• 97.5%

• 93%

• 5%

• 2.5%

Use the image of the normal graph provided. What is the value of the mean?

• 6

• 34

• 52

• 70

Joanne's score on a test gives her a Z-score is -1.50. What does this mean?

• Joanne didn't take the test yet.

• Joanne's test score is 1.50 standard deviations below the average test score.

• Joanne did better than 1.50 times her peers.

• Joanne's test score, on average, was 1.5 points lower than the other test scores.

What is the shape of the data?

• symmetrical

• skewed left

• skewed right

• bell curve

What is the shape of the data?

• symmetrical

• skewed left

• skewed right

• bell curve

Describe the shape of the distribution. Select all that apply.

• symmetric

• skewed left

• skewed right

• bimodal

Describe the shape of the distribution. Select all that apply.

• bell-shaped

• bimodal

• skewed left

• skewed right

A survey of 976 American households found that 32% of the households own two cars.  Identify the the sample. {hint: a survey of what __)

• All American households

• 976 American households

• 32% of Americans own two cars

• two cars