1.

Find the standard deviation by using 20 as assumed mean.

Answer»

SOLUTION :
Here `a=20`
STANDARD DEVIATION `sigma=SQRT((sumf_(i)d_(i)^(2))/(sumf_(i))-((sumf_(i)d_(i))/(sumf_(i)))^(2))`
`=sqrt(6525/37-(265/37)^(2))`
`=sqrt(176.35-51.30)`
`=sqrt(125.05)=11.18`


Discussion

No Comment Found