calculate average marks of the following students using :-(a) direct method ,(b) step deviation method
marks:-
0-10,10-20,20-30,30-40,40-50,50-60,60-70
5,12,15,25,8,3,2
(Numerical of economics)
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Explanation:
x mid point f
0-10 5 5 25
10-20 15 12 180
20-30 25 15 375
30-40 35 25 875
40-50 45 8 360
50--60 55 3 165
60-70 65 2 130
=70 =
divide the total by total of frequency
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