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Find Combined Standard deviation, N1=40,X1=10,SD1=1,N2=60,X2=15,SD2=2

Solution:
Your problem `->` Combined Standard deviation, N1=40,X1=10,SD1=1,N2=60,X2=15,SD2=2


First for Group(1) and Group(2)
`N_1=40,bar X_1=10,sigma_1=1`

`N_2=60,bar X_2=15,sigma_2=2`

Combined 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`






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