Question

25 Girls and 20 Boys are studying in Std:10A.20 girls and 15 boys are in 10B.1

student from each division is to be selected for a competition.

a) What is the probability of getting both are girls?

b) What is the probability of getting at least one girl?
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Answer 1

Answer:

there are 20 girls of 40 students, so the probability of the student from class 10A is 20/40 -> 1/2 or 0.50.

In class 10B, there are 15 girls of 40 students, so the probability of the student from class 10B is 15/40 -> 3/8 or 0.375

To calculate the probability of both students being girls, you must multiply the two, so 0.50 x 0.375 = 0.1875 or 18.75% probability.