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 |

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 |

127