Question

6.The mean of 10 numbers is 20, If 5 is subtracted frome very number ,what will be the
new mean.​

Answer 1

Answer:

$sum \: of \: all \: numbers \\ = mean \times no. \: of \: observations \\ = 20 \times 10 \\ = 200 \\ also \\ total \: amount \: subtracted \\ = 5 \times 10 \\ = 50 \\ therefore \\ new \: sum = 200 -50 = 150 \\ and \: new \: mean \\ = \frac{sum \: of \: observations}{no. \: of \: observations } \\ = \frac{150}{10 } = 15$

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