Question
Sun September 27, 2009 By: Palak Jain

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Expert Reply
Mon September 28, 2009

Class      Class Mean   Frequency   Cumulative Frequency

0-10             5                   7                      7

10-20          15                 14                    21

20-30          25                 13                    34

30-40          35                 12                    46

40-50          45                 20                    66

50-60          55                 11                    77

60-70          65                 15                    92

70-80          75                  8                    100

The median class corresponds to cumulative frequency of 100/2 = 50 i.e 66, and is 40-50.

Median = 40 + ((100/2 - 46)/66)x10 = 40.61

Mode = 40 + [(20 - 12)/(2x20 - 12 - 11)]x10 = 44.71

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