Q.

The mean deviation about median from the data 340, 150, 210, 240, 300, 310, 320, is

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a

50

b

52.8

c

55

d

45

answer is B.

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Detailed Solution

Arranging the observations in ascending order of magnitude, we have 150, 210, 240, 300, 310, 320, 340. Clearly, the middle observation is 300.∴ Median= 300.Calculation of Mean Deviation34015021024030031032040150906001020∴ M.D.=1nΣdi=17Σxi−300=3707=52.8
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The mean deviation about median from the data 340, 150, 210, 240, 300, 310, 320, is