3 learners are taking a maths test, the probability that Maria passes is 0,9; Katlego 0,7; Mpho is 0,6.

Question

1. What is the probability that:
- all three pass?
Maria and Mpho pass but Katlego fails?
- All three fail?
- at least one of them passes?

Answer 1

prob(all three pass) = (0.9)(0.7)(0.6) = ....
prob(Maria and Mpho pass but Katlego fails) = 0.9(0.7)(.4) = ...
prob(all fail) = .....
prob(at least one will pass) = 1 - prob(all fail)