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Question

For the probability distribution given by

X=xi012Pi2536518136 

the standard deviation (σ) is


A
13  
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B
1352    
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C
536    
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D
None of the above
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Solution

The correct option is B 1352    
Mean, E(X)=Pi xi=518+2×136=13
Variance, σ2=E(X2)(E(X))2
=1×518+4×136(13)2=518
 Standard deviation, σ=518=1352 

Mathematics

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