The samples of size 80,40,30,having means 12.5,13,11 respectively are combined find the mean of the combined sample
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Let's call 3 samples S1 S2 and S3
Total = mean × sample size
S1 total = 80 × 12.5 = 1000
S2 total = 40 × 13 = 520
S3 total = 30 × 11 = 330
combined sample size = 80+40+30 = 150
combined total = 1000 + 520 + 330 = 1850
mean of combined sample = 1850/150 = 12.33
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