Electric Pizza was considering national distribution of its regionally successful product and was compiling pro forma sales data. The average monthly sales figures (in thousands of dollars) from its 30 current distributors are listed. Treating them as (a) a sample and (b) a population, compute the standard deviation.
| 7.3 | 5.8 | 4.5 | 8.5 | 5.2 | 4.1 |
| 2.8 | 3.8 | 6.5 | 3.4 | 9.8 | 6.5 |
| 6.7 | 7.7 | 5.8 | 6.8 | 8.0 | 3.9 |
| 6.9 | 3.7 | 6.6 | 7.5 | 8.7 | 6.9 |
| 2.1 | 5.0 | 7.5 | 5.8 | 6.4 | 5.2 |
Solution
