If there are two groups containing 30 and 20 observations and having 50 and 60 as arithmetic means, then the combines average is:
In my opinion, it is 54..if you think anything else, please state how??
THANKS in ADVANCE
If there are two groups containing 30 and 20 observations and having 50 and 60 as arithmetic means, then the combines average is:
In my opinion, it is 54..if you think anything else, please state how??
THANKS in ADVANCE