Maharashtra State BoardSSC (English Medium) 9th Standard
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The Mean of 5 Observations is 50. One of the Observations Was Removed from the Data, Hence the Mean Became 45. Find the Observation Which Was Removed. - Algebra

Sum

The mean of 5 observations is 50. One of the observations was removed from the data, hence the mean became 45. Find the observation which was removed.

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Solution

We have,
The mean of 5 observations is 50.
⇒ The total sum of 5 observations = 50 × 5 = 250

Also, the mean of 4 observations is 45.
⇒ The total sum of 4 observations = 45 × 4 = 180

So, the observation which was removed  = 250 − 180 = 70.

 
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APPEARS IN

Balbharati Mathematics 1 Algebra 9th Standard Maharashtra State Board
Chapter 7 Statistics
Practice set 7.5 | Q 10 | Page 125
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