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The mean of 5 observations is 20 . If we add one new observation then the new mean of the observations is 25 . So find out new added observation.

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Your problem `->` The mean of 5 observations is 20 . If we add one new observation then the new mean of the observations is 25 . So find out new added observation.


Here `n = 5`, Mean X `= 20`

The sum of `5` observation is = X × n `= 20 × 5 = 100`

After adding one new observation, the new Mean X `= 25`,

the sum of `6` observation = new X × n `= 25 × 6 = 150`

`:.` the new observation `= 150 - 100 = 50`.






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