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1. Find Combined Mean and Standard deviation
Method  
  1. Find Combined Mean and Standard deviation`N_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 deviation`N_1=80,bar X_1=520`
    `N_2=20,bar X_2=420`

  3. Find Combined Mean and Standard deviation`N_1=20,bar X_1=50`
    `N_2=50,bar X_2=12`

  4. Find Combined Mean and Standard deviation`N_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 deviation`N_1=80,sum X_1=41600`
    `N_2=20,sum X_2=8400`

  6. Find Combined Mean and Standard deviation`N_1=20,sum X_1=1000`
    `N_2=50,sum X_2=600`


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

 
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