Arithmetic mean of the following series is 20.5 Marks 10 15 20 x 30 35 No. of Students 4 6 10 5 3 2 Find the missing item.
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Answer:
Midpoint (x) No. of students (f) fx
0−10
10−20
20−30
30−40
40−50
50−60 5
15
25
35
45
55 5
10
25
30
20
10 25
150
625
1050
900
550
∑f=100 ∑f(x)=3300
x
=
∑f
∑f(x)
=
100
3300
=33
∴ Mean =33
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