Question

A set of 8 observations has mean 4 and another set of 10 observations has mean 6. Find the combined mean.

Answer 1

Step-by-step explanation:

ANSWER

Mean of 7 observations =10

Sum of 7 observations =10×7=70

Mean of 3 observations =5

Sum of 3 observations =3×5=15

∴ Sum of observations =70+15

=85

Mean of the combined set =

10

85

=8.5

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