One hundred and twenty students appeared in a certain test and following mar distribution was obtained Marks 0-20 20-40 40-60 60-80 80-100 Students 10 30 30 14 Find the limits of middle 30% students. 36 : marks obtained by 100 studente
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Marks No. of students (f) Cumulative Frequency
0−10 5 5
10−20 9 14
20−30 16 30
30−40 22 52
40−50 26 78
50−60 18 96
60−70 11 107
70−80 6 113
80−90 4 117
90−100 3 120
n=120
On the graph paper, we plot the following points:
(10,5),(20,14),(30,30),(40,52),(50,78),(60,96),(70,107),(80,113),(90,117),(100,120).
(i) Median =(
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less than 20
less than 40
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