Probability

Question

In grade 9. there are 25 students, 4 of them are using glasses. If we choose 5 students to join the volleyball team, what is the probability that 2 students in volleyball team use eyeglasses? 

Answer 1

Assuming that 5 is enough for a volleyball team...

 

P(2 use eyeglasses) = ₄C₂•₂₁C₃ ÷ ₂₅C₅ = 6•1330 / 53130 = 38/253 = 0.1502

 

provided the choices are truly random (no prejudice against eyeglass wearers).