Question

calculate mean by step deviation method c.i 5-15 15-25 25-35 35-45 45-55 55-65 frequency 6,11,21,23,14,5

Answer 1

Given :     c.i         5-15   15-25 25-35 35-45 45-55 55-65

             frequency 6,       11,       21,       23,      14,       5

To Find :  mean by step deviation method

Solution:

CLASS        Mean   d= (Mean - 30)/10   f     df

5 - 15            10                  -2                 6       -12

15 - 25          20                 -1                 11       -11

25 - 35         30                 0                 21       0

35 - 45         40                 1                  23        23

45 - 55         50                  2                14         28

55 - 65         60                3                   5        15

                                                           80         43

Mean = 30  +  10 * 43/80

= 30 + 5.375

= 35.375

Learn More :

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Answer 2

Step-by-step explanation:

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