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Find the mean deviation about the mean for the following data :

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a
2.09
b
2.08
c
2.07
d
2.06

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detailed solution

Correct option is A

Meanx¯=ΣfixiΣh=18+40+105+225+88+524+8+15+25+8+4

=52166=8

Now prepare the table given below :

Σh=66,  Σfi|xix¯|=138

 Mean deviation =i=16fi|xix¯|Σfi=13866=2.09

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