JAMB - Mathematics (2020 - No. 21)
Calculate the standard deviation of the following data: 7, 8, 9, 10, 11, 12, 13
2
4
12
17
Explanation
| x | x - x | (x - x)\(^2\) |
|
7 8 9 10 11 12 13
|
-3 -2 -1 0 1 2 3
|
9 4 1 1 0 4 9 -------------- 28
|
S.D = \(\frac{\sqrt\sum (x - x)^2}{N} = \frac{\sum d^2}{N} = \frac{\sqrt{28}}{7}\)
= \(\sqrt{4}\)
= 2
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