Q7 of 26 Page 14


xi

fi

f ixi

|xi -|

fi|xi -|

10

  4

    40

40

160

30

24

  720

20

480

50

28

1400

  0

   0

70

16

1120

20

320

90

  8

  720

40

320

Total

80

4000

1280  

= 234/26 = 9
M.D () = 88/26 = 3.39

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