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The cumulative frequency curve represents the a... - JAMB Mathematics 2000 Question

The cumulative frequency curve represents the ages of ages of students in a school. What age group do 70% of the students belongs?
A
17.5 - 20.5
B
16.5 - 19.5
C
15.5 - 19.5
D
15.5 - 18.5
correct option: a
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