Answer:

Probability of a person having both type O blood and the Rh− factor is 19%

Explanation:

The probability of a person having O blood group is 0.49

The probability of a person having Rh- factor  is 0.15

The probability of a person having either O blood group or Rh- Factor is 0.45

Hence, As per the additive rule of probability

Probability of event A and B together = Probability of A + Probability of A - probability of either A or B

Here event A is occurrence of O blood group

event B is occurrence of Rh- factor

Substituting the given values in above equation, we get –

Probability of a person having both type O blood and the Rh− factor = 0.49 + 0.15 -0.45\= 0.19