MAT-144 · Topic 5 · Mastery Check

Statistics

Four quick questions to check that Topic 5 clicked. Two multiple choice, two short calculations. Perfect score earns one substantive participation post.

What it checks

1Choosing a measure of center
2Mean
3Empirical Rule
4Standard deviation interpretation

4 of 4 to pass 3 attempts 60 seconds between attempts One question at a time

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Question 1 of 4

Question 1 · Choosing a measure of center

Which measure of center is best for a dataset with a few extreme outliers?

A. Mean B. Median C. Mode D. Range

Question 2 · Mean

Find the mean of the following data set: 12, 15, 18, 22, 28. Round to two decimals.

Enter the mean as a decimal, to two places

Question 3 · Empirical Rule

For a normal distribution, approximately what percentage of values falls within one standard deviation of the mean?

A. 50% B. 68% C. 95% D. 99.7%

Question 4 · Standard deviation interpretation

Adult male heights are normally distributed with a mean of 70 inches and a standard deviation of 3 inches. What is the height that is exactly 2 standard deviations ABOVE the mean? Round to two decimals.

Enter the height in inches, to two decimals

All answered.

Submitting uses one attempt.