Q16 of 26 Page 14


xi

fi

f ixi

xi -

(xi - )2

f i(xi - )2

6

  2

  12

-13

169

338

10

  4

  40

-9

81

324

14

  7

  98

-5

25

175

18

12

216

-1

1

12

24

  8

192

5

25

200

28

  4

112

9

81

324

30

  3

  90

11

121

363

Total

40

760  

1736   

==760/40 = 19

Variance (σ 2) = 1736/40 = 43.4

Therefore Standard Deviation (σ ) = =6.58

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