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 Solution will be displayed step by step (In 2 parts) Solution Find Combined Mean, Combined Standard deviation, N1=40,X1=10,SD1=1,N2=60,X2=15,SD2=2Solution:Your problem -> Combined Mean, Combined Standard deviation, N1=40,X1=10,SD1=1,N2=60,X2=15,SD2=2First for Group(1) and Group(2)N_1=40,bar X_1=10,sigma_1=1N_2=60,bar X_2=15,sigma_2=2Combined Mean : bar x_12 = ( N_1 * bar (x)_1 + N_2 * bar (x)_2 )/( N_1 + N_2 )bar x_12 = ( 40 xx 10 + 60 xx 15 )/( 40 + 60 )bar x_12 = ( 400 + 900 )/(100)bar x_12 = 1300/100 Solution provided by AtoZmath.com Any wrong solution, solution improvement, feedback then Submit Here Want to know about AtoZmath.com and me