If the mean of 10 numbers is 7 and mean of 15 numbers is 12, then the combined mean is

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answer is C.

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Detailed Solution

Mean

$A . M = 12 + 15 + x + 19 + 25 + 44 6$

$25 = 115 + x 6$

$x = 150 − 115 = 35$

Mean

$' n'$

$n n + 1$

$n n + 1 2$

Combined Mean

$n$

$n + 1$

$= Sum of observations No . of observation$

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