(C) a
The grade-marks of maths obtain by
a student of a school are as follow.
Marks 0-33
34-50 51-65
66-80 81-100
Student 06
16
40
10
Total
Grade
8
E
D
С
80
B
A
Find the probability of an obtain grade is D ?
(A)
(B) Ž
5
(C) 5
Fill in the blank.
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