Calculate, correct to one decimal place, the standard dev...
Calculate, correct to one decimal place, the standard deviation of the numbers: -1, 5, 0, 2 and 9.
7.2
6.6
3.6
3.2
Correct answer is C
| x | -1 | 5 | 0 | 2 | 9 | Total = 15 |
| x−ˉx | -4 | 2 | -3 | -1 | 6 | |
| (x−ˉx)2 | 16 | 4 | 9 | 1 | 36 | 66 |
Mean = 155=3
SD = √∑(x−ˉx)2n
= √665
= √13.2
= 3.6
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