1. The manager of a small dry cleaner employs six people. As part of their personnel file, she asked each one to record to the nearest one-tenth of a mile the distance they travel one way from home to work. The six distances are listed below: 15.4 11.9 43.7 33.5 11.7 15.9

Find the standard deviation of the distances.

2. The cholesterol levels (in milligrams per deciliter) of 32 adults are listed below:

100 100 105 105 106 106 107 107 109 110 110 112 112 112 114 114 114 115 116 117 118 118 118 118 118 119 120 121 122 125 128 134

Find the interquartile range for the data.

3. The mean of a set of data is 2.94 and its standard deviation is 2.81.

Find the z score for a value of 6.88.

4. The test scores of 40 students are summarized in the frequency distribution below.