The variance of the scores 1, 2, 3, 4, 5 is
-
A.
1, 2 -
B.
1, 4 -
C.
2.0 -
D.
3.0
Correct Answer: Option C
Explanation
(x) | 1 | 2 | 3 | 4 | 5 | sum =15 |
(x – bar{x}) | -2 | -1 | 0 | 1 | 2 | |
((x – bar{x})^{2}) | 4 | 1 | 0 | 1 | 4 | 10 |
Mean = (frac{15}{5} = 3)
(Variance = frac{sum (x – bar{x})^{2}}{n})
= (frac{10}{5})
= (2.0)