Question

The mean of 20 numbers is 18. if 3 is added to each of the first ten numbers, find the new set of 20 numbers.

Answer 1

Step-by-step explanation:

First find the sum of 20 numbers

$sum = 20 \times 18$

$= 360$

as 3 is added to first ten numbers . the sum will be increased by 30

the new sum is 390

now the mean will be

$\frac{390}{20}$

$19.5$

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