Calculate the standard deviation of the following marks; 2, 3, 6, 2, 5, 0, 4, 2
-
A.
1.5 -
B.
1.7 -
C.
1.8 -
D.
1.9
Correct Answer: Option C
Explanation
| x | 2 | 3 | 6 | 2 | 5 | 0 | 4 | 2 | 24 |
| x – (bar{x}) | -1 | 0 | 3 | -1 | 2 | -3 | 1 | -1 | |
| ((x – bar{x})^2) | 1 | 0 | 9 | 1 | 4 | 9 | 1 | 1 | 26 |
Mean = (frac{24}{8} = 3)
Standard deviation = (sqrt{frac{26}{8}})
= (sqrt{3.25})
= 1.802 (approeq) 1.8