Question

Mean of 8 observations is 25 if one observation 11 is exvlided find the mean of the remaning data

Answer 1

Mean of 8 observations is 25.

11 is excluded, so,

New mean = (8*25 - 11) / 7

= (200 - 11) / 7

= 189 / 7

= 27

So new mean = 27

Answer 2

Your answer !!

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$Mean\: of \:8\: observation = 25 \\ \\ \frac{8 \times25 - 11}{7} \\ \\ \frac{200 - 11}{7} \\ \\ \frac{189}{7} \\ \\ 27$

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