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MCQ
The class marks of the classes 0-10, 10-20, 20-30 are:
Unit-11 Basic Statistics
A 0, 10, 20
B 5, 15, 25
C 10, 20, 30
D 5, 10, 15
Explanation

Class marks are (0+10)/2 = 5, (10+20)/2 = 15, (20+30)/2 = 25.

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