Question

the mean of 20 number is 17, if 2 added to each number then new mean​

Answer 1

Answer:

mean=20

no.=17

$mean = \frac{sum \: of \: numbers}{total \: number \: of \: addends} \\ 20 = \frac{sum \: of \: numbers}{17} \\ 20 \times 17 = sum \: of \: numbers \\ 340 = sum \: of \: numbers \\ now \: 2 \times 17 + 340 = 34 + 340 = 374\\ since \: new \: mean = \frac{sum \: of \: numbers}{total \: number \: of \: addends} \\ = \frac{374}{17} \\ = 54$