Please solve my question

Dear student
 
Weight (in grams) Mid-Valuesxi Frequencyfi di=xi-202.5 di2 fidi fidi2
200–201 200.5 13 −2 4 −26 52
201–202 201.5 27 −1 1 −27 27
202–203 202.5 18 0 0 0 0
203–204 203.5 10 1 1 10 10
204–205 204.5 1 2 4 2 4
205–206 205.5 1 3 9 3 9
    N = fi=70     fidi=-38 fidi2=102

Now,

Variance, σ2
=1Nfidi2-1Nfidi2=170×102-170×-382=1.457-0.295=1.162 gm

Standard deviation, σ = Variance=1.162=1.08 gm

Regards

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