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The mean of 10 observation is …

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The mean of 10 observation is 42. If each observation in the data is decreased by 12 what will be the new mean of the data?

Posted by Trupti Saike 4 years, 11 months ago

CBSE > Class 09 > Mathematics

1 answers

Gaurav Seth 4 years, 11 months ago

SHORT FORMULA
NEW MEAN =MEAN - THE COMMON NUMBER DECREASED
=40-12
=30

Detailed solution :

Mean=sum of total observation /total number of observation
42=sum of total observation /10
420=sum of total observation
Now each member of the observation is decreased 12
=12*10=120
New sum of total observation =420-120
=300
New mean =300/10
=30

0Thank You

ANSWER

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CBSE > Class 09 > Mathematics