The mean weight of 8 numbers is 15, if each number is multiplied by 2, what will be the new mean

**Let,** 8 numbers be: x_{1}, x_{2}, x_{3}, .......,x_{8}

Now, mean of the above numbers

When number is multiplied by 2, then new numbers are: 2x_{1}, 2x_{2}, 2x_{3}, ......., 2x_{8}

Therefore, new mean

Hence, the new mean of 8 numbers will also be doubled i.e., become 30.

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