Thirty-nine cities provided information on vacancy rates (in percent) in local apartments in the following frequency...
|
Thirty-nine cities provided information on vacancy rates (in percent) in local apartments in the following frequency distribution. |
| Vacancy Rate (in percent) | Frequency |
| 0 up to 3 | 7 |
| 3 up to 6 | 4 |
| 6 up to 9 | 9 |
| 9 up to 12 | 6 |
| 12 up to 15 | 13 |
| a. |
Calculate the average vacancy rate. (Round your answer to 2 decimal places.) |
| Average vacancy rate |
| b. |
Calculate the variance and the standard deviation for this sample. (Round your intermediate calculations to 4 decimal places and final answers to 2 decimal places.) |
| Variance | |
| Standard deviation | |
Homework Answers
| Frequency(f) | M | fM | m-u | (M-u)^2 | f(M-u)^2 |
| 7 | 1.5 | 10.5 | -7.077 | 50.08393 | 350.5875 |
| 4 | 4.5 | 18 | -4.077 | 16.62193 | 66.48772 |
| 9 | 7.5 | 67.5 | -1.077 | 1.159929 | 10.43936 |
| 6 | 10.5 | 63 | 1.923 | 3.697929 | 22.18757 |
| 13 | 13.5 | 175.5 | 4.923 | 24.23593 | 315.0671 |
N = 39
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