Question

What is the mean of 60, 90, 85, 80, 95, 90, 75, 70, 100

Answer 1

$mean = \frac{sum \: of \: observation}{no.of \: observation} \\ mean = \frac{60 + 90 + 85 + 80 + 95 + 75 + 70 + 100}{8} \\ mean = \frac{655}{8} = 81.875(ans)$

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Answer 2

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$mean \: = \frac{sum \: of \: all \: observations \: }{total \: no \: of \: observations \: }$

HENCE

$mean \: = \frac{60 + 90 + 85 + 80 + 95 + 90 + 75 + 70 + 100}{9}$

$mean \: = \frac{745}{9}$

HENCE MEAN = 82.77

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