Class 11 Maths Statistics Mean deviation about point

Mean deviation about point a: It determines the Mean deviation about a given point.

Commonly used Mean deviation about any point are:

Mean deviation about Mean

Mean deviation about Median

 

Numerical: Let’s find mean deviation about the median for the following data: 48,49,50,50,50,51,52   runs    &    0,25,26,50,50,99,100   runs. 

Solution: Median is 50 for both case.

Case 1: 48,49,50,50,50,51,52 runs.

Deviation from Mean (50) is |Data-Mean|

Mean Deviation = (2+1+0+0+0+1+2)/7  = 6/7 runs

 

Case 2: 0,25,26,50,50,99,100   runs

Deviation from Mean (50) is |Data-Mean|

Mean Deviation = (50+25+24+0+0+49+50)/7  = 198/7 runs

 

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