Adu's scores in five subje...
Adu's scores in five subjects in an examination are 85, 84, 83, 86 and 87. Calculate the standard deviation.
2.0
1.4
1.8
1.6
Correct answer is B
n = 5
x̄ = ∑xn=85+84+83+86+875=4255=85
x | x−x̄ | (x−x̄)2 |
85 | 0 | 0 |
84 | -1 | 1 |
83 | -2 | 4 |
86 | 1 | 1 |
87 | 2 | 4 |
Σ(x−x̄)2=10 |
S.D=√∑(x−x̄)n=√105
∴ S.D = √2 =1.4
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