Question

The mean of 25 observations is 27. If one observation is included, the mean still remains the same, find the observation.

Answer 1

Heyaaa..!!!

Here you go...

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✴MEAN=SUM OF OBSERVATIONS/NO. OF OBS.
$27 = Sum \: \div 25 \\ Sum \: = 675 \\ \\ 27 = New \: sum \div 26 \\ New \: sum = 702 \\ thus \: New \: observation \: was = 702 - 675 = 27$
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HOPE IT HELPS

@Rêyaañ11

Answer 2

Mean =(sum of 25 observations)/25

27=(sum of 25 observations)/25

27*25 =sum of 25 observations

675= sum of 25 observations
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Now, number included be x,.

27=(sum of 25 observations +x)/26

27*26=675+x

702=675+x

702-675=x

27=x


Now,

The included number is 27.



I hope this will help you


-by ABHAY