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

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

  1. A

    50

  2. B

    52.8

  3. C

    55

  4. D

    45

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    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 Deviation

    xidi=xi300

    340

    150

    210

    240

    300

    310

    320

    40

    150

    90

    60

    0

    10

    20

    Totaldi=214xi300=370

     M.D.=1nΣdi=17Σxi300=3707=52.8

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