Question

Two students h and k appeared in an examination. The probability that h will qualify the exam is 0.05 and that the probability that k will qualify the examination is 0.21. The probibality that both will qualify the examination is 0.03 find the probibality that .(a)both h and k will not qualify the examination(b)only h will qualify the examination(c)only k will qualify the examination(d)only one of them will qualify the examination

Answer 1

If the events are independent, the probability of both/all events occurring is determined by multiplying the probabilities of the individual events.

a) (1-.05)(1-.21) = ?

b) .05(1-.21) = ?

c) Follow same process.

d) This is saying that either h or k will qualify. Either-or probabilities are found by adding the individual probabilities.

Add answers from b and c.