Question

the mean of five no. is 27 . if one no. is excluded, their mean is 25 . find the excluded observation .

Answer 1

Answer:

Excluded number = (27 x 5) – (25x 4)

= 135 – 100

= 35

Answer 2

Mean of 5 numbers - 27
Their sum
$= 5 \times 27 \\ = 135$
Mean of other 4 numbers - 25
Their sum
$= 4 \times 25 \\ = 100$
The excluded number is
$135 \: - \: 100 \\ = \: 35$

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