10 is the mean of a set of 7 observation...

10 is the mean of a set of 7 observations and 5 is the mean of a set of 3 observations. The mean of a combined set is given by

A

15

B

10

C

8.5

D

7.5

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Model Test Set - 5
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UNITED BOOK HOUSE-Model Test Set - 4-Exercise

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