# RS Aggarwal Solutions Class 9 Mathematics Solutions for Probability Exercise 19 in Chapter 19 - Probability

Question 6 Probability Exercise 19

The percentages of marks obtained by a student in six-unit tests are given below:

Unit test Percentage of marks obtained
I 53
II 72
III 28
IV 46
V 67
VI 59

A unit test is selected at random. What is the probability that the student gets more than 60% marks in the test?

We know that

Number of tests which he gets more than 60% is 2

The total number of tests is 6

So we get

Required probability = Number of tests which he gets more than 60%/ total number of tests

By substituting the values

Required probability = 2/6

On further calculation

Required probability = 1/3

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