Math, asked by MadhuSubramanian04, 1 year ago

Calculate the arithmetic mean of the following using step deviation CI 0-20 20-40 40-60 60-80 80-100 100-120
F 20 35 52 44 38 31

Answers

Answered by anidruth26
4

Answer:

60 (approx.)

Step-by-step explanation:

cl                    f         x        d      u      fu

 0-20          20       10      -40   -2      -40

20-40          35       30     -20   -1       -35

40-60         52        50      0    0           0

60-80         44        70     20     1         44

80-100        38       90      40    2         76

100-120       31       110       60    3        63

            ∑f= 220                               ∑fu= 108

mean= a+ (∑f/∑fu)h

mean= 50+ (108/220)20

mean= 658/11 = 59.8181818181 ≈ 60

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