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 ?
(i)
"X=60"
(ii)
"6Y=2320-565-1035"
"Y=120"
(iii)
"+\\dfrac{50(113-116)^2+60(120-116)^2+90(115-116)^2}{200}"
"90(Z)^2=5760.1032"
"Z=8"
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