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Question

The mean deviation about the median of the following set of observations 3,9,5,3,12,10,18,4,7,19,21 is 58/k then k=

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Solution

Arranging data in ascending order,
3,3,4,5,7,9,10,12,18,19,21
Number of observation (n)=11 (odd)
Median=(11+12)thobs=6thobs
Median(M)=9
Now, we calculate mean deviation about median
M.D.(M)=|xiM|11

=|39|+|39|+|49|+|59|+|79|+|99|+|109|+|129|+|189|+|199|+|219|11
=6+6+5+4+2+0+1+3+9+10+1211
=5811

k=11

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