Calculate the mean of the following distribution: Class Interval Frequency 0-10 8 10-20 5 20-30 12 30-40 35 40-50 24 50-60 16

ICSE Class X Math 2015 Solved Paper - Question 28

Question : 28 of 52

Marks: +1, -0

Calculate the mean of the following distribution:

Solution:

Class	Mid value (x)	f	fx
0-10	5	8	40
10-20	15	5	75
20-30	25	12	300
30-40	35	35	1225
40-50	45	24	1080
50-60	55	16	880
		Σf=100	Σfx=3600

\;\text " Mean "\;=\ov{x}\;=\;{Σ f x}/{Σ f}

\;=\;{3600}/{100}=36 .

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