1.

For the frequency distribution

Answer»


SOLUTION :
`SD=SQRT((Sigmaf_(i)d_(i)^(2))/N-((Sigmaf_(i)d_(i))/N)^(2))`
=sqrt(137/60-(37/60)^(2) )
`sqrt(2.2833-(0.616)^2)
`=sqrt(2.2833-0.3794)`
`sqrt(1.9037)=1.38`


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