The percentage of marks obtained by a student in the monthly unit tests are given
below.
Unit Test
L III IV V
Percentage of marks
58647662 85
Obtained
In a randomly selected unit, find the probability that the student gets
(i) a first class i.e. at least 60% marks
(ii)
(iii)
(iv)
marks between 70% and 80%
a distinction i.e. 75% or above
less than 65% marks.
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Answer:
Total no. of unit tests =5
Number of tests in which the student scored more than 70% marks =3
Therefore,
Probability that a student gets more than 70% marks =
Total no. of tests
No. of tests in which the student scored more than 70% marks
=
5
3
=0.6
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