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Q.

Mean deviation about mean from the following data:xi:    3    9    17    23    27fi:    8    10    12    9    5, is

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a

6

b

7

c

8

d

9

answer is B.

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Detailed Solution

Calculation of mean deviation about mean.391723278101295249020420713512628129660247260N=Σfi=44 Σfixi=660 Σfixi−15=312mean =X¯=ΣfixiN=66044=15Mean deviation =M⋅D⋅=1NΣfixi−15=31244=7.09≃7
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