1.

Find the standard deviation from the following observations: 15,18,13,20,17,10,16,19,22,20.

Answer»

Solution :
Here `N=10`
LET ASSUMED mean `a=16`
STANDARD DEVIATION `sigma=sqrt((sumd_(i)^(2))/n-((sumd_(i))/n)^(2))`
`=sqrt(128/10-(10/10)^(2))`
`sigma=sqrt(12.8-1)`
`=sqrt(11.8)=3.42`


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