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Determine the group sample standard deviation and variance for the following frequency distribution table.
| Classes | Frequency |
| 10 - 19 | 5 |
| 20 - 29 | 11 |
| 30 - 39 | 7 |
| 40 - 49 | 3 |
| 50 - 59 | 8 |
A. variance is 193.77 and standard deviation is 13.92
B. variance is 14.13 and standard deviation is 199.66
C. variance is 13.92 and standard deviation is 193.77
D. variance is 199.66 and standard deviation is 14.13