The data above shows the frequency distribution of marks scored by a group of students in a class test. How many students took the test?

The data above shows the frequency distribution

of marks scored by a group of students in a class

test.

How many students took the test?

A 13
B 14
C 15
D 18
E 20

waec 1992 mathematics

The correct answer is C. 15

No explanation given

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