|
If the arithmetic mean of 9 observations is 100 and that of 6 observations is 80, then the combined mean of all the 15 observations will be |
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|
(a) |
100 |
(b) |
80 |
(c) |
90 |
(d) |
92 |
|
If the arithmetic mean of 9 observations is 100 and that of 6 observations is 80, then the combined mean of all the 15 observations will be |
|||||||
|
(a) |
100 |
(b) |
80 |
(c) |
90 |
(d) |
92 |