If 10 is the mean of a set of 7 observations and 5 is the mean of a set of 3 observations. Then find the mean of combined set.
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Answer:
8.5
Step-by-step explanation:
Mean if 7 observations= 10
Sum of 7 observations= 10×7 = 70
mean of 3 observations= 5
Sun of 3 observations= 5×3= 15
Combined sum of 10 observations= 70+ 15= 85
Mean of combined set= (Sum of all observations)÷ (Total number of observations)
= 85÷10 = 8.5
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