Question

the marks of 80 students in maths (out of 80) were recorded as follows:- marks:-0 - 20, 21 - 39, 40 - 60, 61-80 no.of students:- 18,19,23,20
if the passing marks are 40% then find the probability ythat the student chosen at random:
(i) got the passing marks?
(ii)failed to get the passing marks?
(iii) got below 21 marks?






please tell.​

Answer 1

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