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Question
The variance of the scores 2,4,6,8,10 is
The variance of the scores 2,4,6,8,10 is
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Solution
The correct option is B 8
Scores are 2,4,6,8,10 n= 5
Variance = σ2=∑i=ni=1(Xi−μ)2n
Mean = μ=2+4+6+8+105=305=6
Variance =(2−6)2+(4−6)2+(6−6)2+(8−6)2+(10−6)25=16+4+0+4+165=405=8
Scores are 2,4,6,8,10 n= 5
Variance = σ2=∑i=ni=1(Xi−μ)2n
Mean = μ=2+4+6+8+105=305=6
Variance =(2−6)2+(4−6)2+(6−6)2+(8−6)2+(10−6)25=16+4+0+4+165=405=8
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