1.

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

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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



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