Question

Students A and B have probabilities of failing an exam of 1/2 and 1/5 respectively. The
probability of them both failing the examination is 1/10 Determine the probability that at
least one of the two students fail.​

Answer 1

Step-by-step explanation:

P(A)=1/2.

P(B)=1/5

P(AandB)=1/10 {probability of both failing}

probability that at least one fails is the probability that either one of two fails

P(AUB) = P(A) +P(B) -P(AandB)

= 1/2 + 1/5 - 1/10

= 0.5 +0.2 - 0.1

= 0.6 or 6/10