Quiz 2.1 Statistics Quiz

The time in minutes for each of Sam's phone calls this week are shown in the list: {9, 15, 5, 7, 9, 12, 11, 4}. Which statement is true regarding the duration of his calls?

• The median is greater than 10.

• The mean is less than 8.

• The range is less than 10.

• The mode is greater than 7.

For the data set shown below, which measure is the greatest? {5, 6, 6, 8, 9, 10}

• Mean

• Median

• Mode

• Range

Jordan and Alex are pitchers for the baseball team and are being evaluated by the coach. The speeds in miles per hour of each of their practice pitches are shown to the left.

• Jordan has a lower mean speed.

• Jordan has a greater range of speeds.

• Jordan has a lower median speed.

• Alex's median speed is higher than Jordan's mean speed.

The box-and-whisker plot shows the heights in centimeters of high school seniors compared to their heights as freshmen. Using the median as the measure, which is closest to the difference in height between the freshmen and seniors?

• 0 cm

• 5 cm

• 10 cm

• 15 cm

A baker recorded the number of batches of cookies he made on each of seven days. He baked a different number of batches of cookies each day. The box-and-whisker plot to the right summarizes his data. The baker baked 20 batches of cookies on the eighth day. He redraws the box-and-whisker plot to include his data. Which statement comparing the new box-and-whisker plot to the original box-and-whisker plot is NOT true?

• The median increased.

• The lower extreme increased.

• The upper extreme increased.

• The value of the interquartile range increased.

The number of points two basketball teams scored is shown in the diagram below. Team A scored a different number of points in each of the team's 20 games. Team B scored a different number of points in each of the team's 12 games. What is the total number of games that Team A and Team B scored 55 or more points?

• 18

• 20

• 21

• 25

Find the mean absolute deviation of the data set below. {152, 178, 172, 180, 193}

• 10.4

• 8.4

• 13.4

• 175

Find the standard deviation for the test scores given in the following stem-and-leaf plot.

• 8.3

• 9.3

• 6.7

• 86.5

The data set below gives the scores of seven people on a history test. Which correctly gives the standard deviation and variance of the data set? {74, 78, 83, 89, 90, 92, 96}

• Standard Deviation = 7.3; Variance = 86

• Standard Deviation = 53.2; Variance = 86

• Standard Deviation = 7.3; Variance = 53.2

• Standard Deviation = 86; Variance = 53.2

If the variance for a data set is 104.04, what is the standard deviation?

• 10.2

• 12.04

• 10.4

• 14.22