Question

There are 9 students in a class: 5 boys and 4 girls. If the teacher picks a group of 4 at random, what is the probability that everyone in the group is a boy?

Answer 1

Answer:

The probability is 0.0397.

Step-by-step explanation:

There are 9 students in a class: 5 boys and 4 girls.

The teacher picks a group of 4 at random.

So, the probability that everyone in the group is a boy is given by :

$(5/9)(4/8)(3/7)(2/6)=120/3024=0.0397$

Or $(5C4)/(9C4)=0.0397$

Hence, the probability is 0.0397.