Statistics Chapter Review

The owner of a convenience store keeps track of how many customer buy lunch food during the “noon rush” each day for four days and calculates that the mean number of customers for those four days is 52. How many customers must come in on the fifth day to make the five-day mean 54?

• 54

• 60

• 62

Which of the distributions displayed in the dot plots has the highest standard deviation?

• Distribution A

• Distribution B

• Distribution C

The histogram shows the typical travel time to school (self-reported) for 50 high school students. Which of the following statements is true about the mean and median of this distribution?

• Mean > Median

• Mean < Median

• Mean = Median

Jerome’s summer reading list has 8 books, and he is examining the number of pages in each book. After calculating the mean, median, standard deviation, and interquartile range, he realized that the longest book is actually 100 pages longer than he thought it was. Which of his measurements does he need to recalculate?

• The mean, standard deviation, and interquartile range.

• The mean and standard deviation.

• Only the mean.

Researchers record the weights in pounds of 40 cheetahs in the wild. The histogram shows the data that were collected. The percentage of cheetahs that weigh more than 200 lbs is closest to

• 10%

• 6%

• 3%

• 0.75%

Researchers record the weights in pounds of 40 cheetahs in the wild. The histogram shows the data that were collected. Which of the following statements about the distribution is NOT correct?

• The histogram is right-skewed

• The median is greater than 120 lbs

• The histogram is unimodal

• The mean and median are the same.

The mean age of female teachers is 36, the mean age of male teachers is 33. What must be true about the mean age of all teachers?

• It must be 34.5

• It must be larger than the median age

• It could be any age between 33 and 36

• It must be larger than 36

What percent of all large companies receiving surveys responded?

• 12.5%

• 20%

• 33%

• 62.4%

Which of the following conclusions is not supported by the data? (select all that apply)

• There are more large companies than small companies in the survey.

• Large companies appeared to have a higher response rate than medium or small companies.

• Small companies were most likely to respond.

• Overall, less than half of companies responded to the survey.

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

• The first quartile for the two sections is the same.

• 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.