Find the sample variance of the data in the following frequency distribution.
X | Frequency |
10 | 2 |
15 | 2 |
20 | 4 |
25 | 2 |
total (=n) | 10 |
A. 18.00
B. 25.00
C. 26.00
D. 28.89
X | Frequency (f) | f*x | f*x^2 |
10 | 2 | 20 | 200 |
15 | 2 | 30 | 450 |
20 | 4 | 80 | 1600 |
25 | 2 | 50 | 1250 |
Total | 10 | 180 | 3500 |
Sample varinace
Answer :D. 28.89
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