Mean of a set of 8 observations is 10 and 4 is the mean of a set of 7 observations. The mean of the combined set is given by:
A. 10.8
B. 7.2
C. 8.2
D. 9
Answer:D
Mean of a set of 8 observations is 10 and 4 is the mean of a set of 7 observations. The mean of the combined set is given by:
A. 10.8 B. 7.2 C. 8.2 D. 9