Question

20 परिणामों का औसत 18 है। प्रत्येक परिणाम में से 3
घटाने पर नया औसत क्या होगा?
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Answer 1

Given : 20 परिणामों का औसत 18 है।

Average of 20 results is 18

To Find : प्रत्येक परिणाम में से 3 घटाने पर नया औसत  

3 is subtracted from each result , find new average

Solution:

Average = (sum of all observations ) / ( number of observations )

=>  18  = sum of all observations / 20

=>  sum of all observations = 360

3 is subtracted from each result  Hence 20 * 3 = 60 subtracted

New Sum  of all observations = 360 - 60 = 300

New Average = 300/20   = 15

20 परिणामों का औसत 18 है। प्रत्येक परिणाम में से 3 घटाने पर नया औसत 15 होगा

Short cut : 18 - 3 = 15

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