Calculate the standard deviation of 30, 29, 25, 28, 32 an...
Calculate the standard deviation of 30, 29, 25, 28, 32 and 24.
2.0
2.8
3.0
3.2
Correct answer is B
| x | x−μ | (x−μ)2 |
| 24 | -4 | 16 |
| 25 | -3 | 9 |
| 28 | 0 | 0 |
| 29 | 1 | 1 |
| 30 | 2 | 4 |
| 32 | 4 | 16 |
| ∑ = 168 | 46 |
μ=24+25+28+29+30+326=1688=28
S.D=√∑(x−μ)2n=√466
= √7.67≊
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