The following data indicates the marks of 53 students in Mathematics.
Marks Number of students
0-10 5
10-20 3
20-30 4
30-40 3
40-50 4
50-60 4
60-70 7
70-80 9
80-90 7
90-100 8
Draw less than type ogive for the data above and hence find the median.
Answers
C.I f c.f
0 --10 5 5
10---20 3 8
20--30 4 12
30--40 3 15
40--50 4 19
50--60 4 23
60--70 7 30
70--80 9 39
80---90 7 46
90---100 8 54
N = 54 or N / 2 = 27 c.f > N / 2 is 30 and C.I = 60---70
60---70 is median class. Now l = 60, f = 7, F = 23, h = 10
Median = i + N/2 - F/f x h or 60 + 27 - 23/7 x 10
60 +40/7 = 65.7
Answer:
Hope you will understand!