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1. Find Combined Mean and Standard deviation
Method
1. Find Combined Mean and Standard deviationN_1=40,bar X_1=10,sigma_1=1
N_2=60,bar X_2=15,sigma_2=2

2. Find Combined Mean and Standard deviationN_1=80,bar X_1=520
N_2=20,bar X_2=420

3. Find Combined Mean and Standard deviationN_1=20,bar X_1=50
N_2=50,bar X_2=12

4. Find Combined Mean and Standard deviationN_1=40,sum X_1=400,V_1=1
N_2=60,sum X_2=900,V_2=4

5. Find Combined Mean and Standard deviationN_1=80,sum X_1=41600
N_2=20,sum X_2=8400

6. Find Combined Mean and Standard deviationN_1=20,sum X_1=1000
N_2=50,sum X_2=600

 2. Combined Mean X12 = , X1 = , N1 = , N2 = , find X2 Combined Mean bar X_(12) = 40, bar X_1 = 10 , N_1 = 1, N_2 = 60, find bar X_2Combined Mean bar X_(12) = 80, bar X_1 = 520 , N_1 = 20, N_2 = 420, find bar X_2Combined Mean bar X_(12) = 20, bar X_1 = 50 , N_1 = 50, N_2 = 12, find bar X_2
SolutionHelpExample-1Example-2