Solution:Given that in a class of 40 students, there are 16 girls and 24 boys and out of these, ten are 'A' students.
We need to find the probability that if a student is chosen at random, it is an ‘A’ student.
Probability of an event E is defined as:
There are 40 students in the class.
Therefore, the total number of possible outcomes is 40.
There are 10 'A' students, therefore the number of favorable outcomes is 10.
Let be the event that a 'A' student is selected from a class of 40 students.
Now, the probability of selecting a 'A' student is,
The probability of selecting a 'A' student is .
Therefore, option 4 is correct.