MathematicsThe A.M of 10 numbers is 7. The A.M of 15 numbers is 12, then the mean of all observations is

The A.M of 10 numbers is 7. The A.M of 15 numbers is 12, then the mean of all observations is

  1. A

    12

  2. B

    11

  3. C

    9

  4. D

    10

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    Solution:

    10×7+15×1225

    =25025=10

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