Class 11

Math

Algebra

Sequences and Series

Multiplied by 3

$=672 =12$

If $xˉ$ is the mean of n number of observations $x_{1},x_{2},x_{3},....,x_{n},$ then mean of $ax_{1},ax_{2},ax_{3},....,ax_{n},$ is $axˉ$

Thus, when each of the given data is multiplied by 3, the mean is also multiplied by 3.

Mean of the original data is 12.

Hence, the new mean = 12 x 3 = 36