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Class 11
>>Economics
>>Measures of Central Tendency
>>Arithmetic Mean in Statistics
>>From the following table compute arithme
Question
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From the following table compute arithmetic mean by direct method.
Marks 0−10 10−20 20−30 30−40 40−50 50−60
No. of students 5 10 25 30 20 10
Medium
Solution
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Marks 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
Step-by-step explanation:
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