 Hello and welcome to the session. In this session we discussed the following question which says the percentages of marks obtained by a student in 6 unit tests are given below. A unit test is selected at random. What is the probability that the student gets more than 40% marks in the test? This table shows that the percentage of marks obtained by the student in unit test 1 is 50% marks. In unit test 2 is 44% marks. In unit test 3 is 32% marks. In unit test 4 is 20% marks. In unit test 5 is 65% marks. And in unit test 6 is 70% marks. Before we move on to the solution let's recall the formula to find the probability of an event E. This is equal to the number of trials in which the event E has happened upon the total number of trials. This is the key idea to be used for this question. Now we move on to the solution. Now here we have the total number of tests is equal to 6. Now from the table you can see that the student obtained more than 40% marks in 4 unit tests. That is in unit test 1, in unit test 2, in unit test 5 and in unit test 6. So now the number of tests in which the student gets 40% marks is equal to 4. We consider even to be an event such that student gets more than 40% marks in the test. So now probability of event that is the probability of student getting more than 40% marks in the test is given by the number of tests in which he gets more than 40% marks that is 4 upon the total number of tests which is 6. And this is equal to 2 upon 3. So we say that the probability that the student gets more than 40% marks in the test is equal to 2 upon 3. So this 2 upon 3 is the final answer. This completes this session. Hope you have understood the solutions for this question.