Consider the frequency distribution Class interoal: 0−66−1212−18 Frequency: 246The variance of the above frequency distribution, is

Consider the frequency distribution

 Class interoal: 066121218 Frequency: 246

The variance of the above frequency distribution, is

  1. A

    24

  2. B

    12

  3. C

    20

  4. D

    25

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    Solution:

    Computation of variance

    Class-intervalmid-valuesFrequencyfixifixi2

    0-6

    6-12

    12-18

    3

    9

    15

    2

    4

    6

    6

    36

    90

    18

    324

    1350

      Σfi=12Σfixj=132Σfixi2=1692

     Var(X)=1Nfixi21Nfixi2 Var(X)=169212132122=141121=20

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