Question

Find the harmonic mean of the following distribution : Class Intervals : 0-10 ,10-20 ,

20-30 ,30-40 ,40-50 ,50-60, 60-70 ,70-80

Frequency : 5 ,8 ,11 ,21 ,35, 30 ,22 ,18​

Answer 1

Answer:

The mean of the following data is 47.73.

Step-by-step explanation:

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Answer 2

Answer:

47.73

Step-by-step explanation:

Class       Mid value (x)  f  fx

0-10                           5          5        25

10-20                  15        8   120

20-30                  25          11   275

30-40                  35         21   735

40-50                  45         35   1575

50-60                  55         30   1650

60-70                  65          22 1430

70-80                  75          18 1350

   

Total                          150 7160

f = 150

fx = 7160

=7160/150  

47.73