There are three Groups A,B and C with no. of persons 50, X, 90. The mean and Standard deviations for these groups are 113, Y, 115 and 6, 7, Z respectively. The Combind n , mean and Standard deviation for three groups are 200,116 and 7.746.

(i) What is n ( The value of X ) for Group II .

(ii) Mean (Value of Y ) of Group II?

(iii) S.D. (Value of Z) of Group III ?

Q//(i) What is n ( The value of X ) for Group II .

(ii) Mean (Value of Y ) of Group II?

(iii) S.D. (Value of Z) of Group III ?

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