Find the variance of 11, 12, 13, 14 and 15.
...Find the variance of 11, 12, 13, 14 and 15.
2
3
√2
13
Correct answer is A
Variance(σ2)=∑(x−μ)2n
The mean (μ) of the data = 11+12+13+14+155=655=13
| x | (x−μ) | (x−μ)2 |
| 11 | -2 | 4 |
| 12 | -1 | 1 |
| 13 | 0 | 0 |
| 14 | 1 | 1 |
| 15 | 2 | 4 |
| Total | 10 |
σ2=105=2
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