Question

A set of 7 observations has mean 10 and
another set of 3 observations has mean
5. The mean of combined set is
(P.S.) (. )
A) 15.8
B) 8.5
C) 19.2
D) 17.5​

Answer 1

Answer:

8.5

Step-by-step explanation:

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.

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