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Question

The variance of the data 2, 4, 6, 8, 10 is:
 
  1. 7
  2. 8
  3. 6
  4. none of these


Solution

The correct option is B 8
Mean(¯x)=xin=((2+4+6+8+10)5=6
                              
Variance(σ2)=(x¯x)2n=(26)2+(46)2+(66)2+(86)2+(106)25=(16+4+0+4+16)5=405=8
 

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