AP Statistics Unit Review

• A

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• D

• E

A slice of pizza from a certain restaurant has an average area of 40 square inches with a standard deviation of  5 square inches.  Assuming the distribution of areas is approximately normal, what proportion of slices will be between 35 and 50 square inches

• 68%

• 34%

• 81.5%

• 95%

Given is the number of miles traveled to work for 28 people. Which is the closest to the percentile rank of the person who traveled 69 miles? 

• 5th

• 18th 

• 82nd

• 10th

If a distribution is symmetrical, which of the following is true?

• the mean must be less than the median

• the mean and median must be equal

• the mean must be greater than the median

• the mean is either equal to or less than the median

• it's impossible to tell which of the above statements is true without seeing the data

Is this a probability distribution?

• No, the sum of p(x) does not equal 1.

• Yes, all p(x) are between 0 and 1.

• No, all p(x) are not between 0 and 1.

• Yes, the sum p(x) is 1.

Is this a probability distribution?

• No

• Yes

• A

• B

• C

• D

• E

The stem-and-leaf diagram below gives the distribution of the ages in years of 20 participants at a family reunion. Which of the following statements about the distribution is correct?

• The first quartile is larger than the third quartile.

• The distribution is strongly skewed to the left.

• It makes the most sense to use the mean and standard deviation as a numerical summary of the center and spread of this distribution.

• The mean is larger than the median.

The side-by-side boxplots show the distribution of test scores in Ms. Williams’s two sections of calculus. Based on these boxplots, which one of the following statements must be true?

• The lowest score in A period was close to the 15th percentile of the C period class.

• The mean score for students in C period was higher than the mean score for students in A period.

• More people scored between 72 and 90 in C period than scored between 72 and 81 in A period.

• The standard deviation of scores in A period is smaller than the standard deviation of scores in C period.

• A

• B

• C

• D

• E