1.

Find the standard deviation of 8,11,14,17,20,23,26.

Answer»

Solution :
Here `n=7`
Arithmetic MEAN `BARX=(sumx_(i))/n=119/7=17`
STANDARD deviation `sigma=SQRT((sum(x_(i)-barx)^(2))/n)`
`=sqrt(252/7)=sqrt(36)=6`.


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