NDA Math Statistics Part 2

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Direction : Consider the following for the next two (02) items that follow.
The marks obtained by 60 students in a sertain subject out of 75 are given below :
Marks Number of students
15-20 4
20-25 5
25-30 11
30-35 6
35-40 5
40-45 8
45-50 9
50-55 6
55-60 4
60-65 2
[NDA-II 2021]
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