II.25. Drive time. Professor Moore, who lives a few miles outside a college town, records the time he takes to drive to the college each morning. Here are the times (in minutes) for 42 consecutive weekdays, with the dates in order along the rows:
| 8.25 | 7.83 | 8.30 | 8.42 | 8.50 | 8.67 | 8.17 |
| 9.00 | 9.00 | 8.17 | 7.92 | 9.00 | 8.50 | 9.00 |
| 7.75 | 7.92 | 8.00 | 8.08 | 8.42 | 8.75 | 8.08 |
| 9.75 | 8.33 | 7.83 | 7.92 | 8.58 | 7.83 | 8.42 |
| 7.75 | 7.42 | 6.75 | 7.42 | 8.50 | 8.67 | 10.17 |
| 8.75 | 8.58 | 8.67 | 9.17 | 9.08 | 8.83 | 8.67 |
(a) Make a histogram of these drive times. Is the distribution roughly symmetric, clearly skewed, or neither? Are there any clear outliers? (Hint: See pages 247 and 249.)
(b) Make a line graph of the drive times. (Label the horizontal axis in days, 1 to 42.) The plot shows no clear trend, but it does show one unusually low drive time and two unusually high drive times. Circle these observations on your plot. (Hint: See page 223.)