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UPSC 2015 CDS I Math Paper

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For the next four (4) items that follow :

Consider the following frequency distribution :

Class	Frequency
0-10	4
10-20	5
20-30	7
30-40	10
40-50	12
50-60	8
60-70	4

[2015 CDS-I]

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Question : 97

Total: 100

What is the mean of the distribution?

37.2
38.1
39.2
40.1

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