People have one of four blood types - O, A, B or AB and each blood type is further classified as Rh-positive or Rh-negative. For a particular country, the percentages of the population having each blood type are shown below.

Rh O A B AB

Positive 38% 34% 9% 3%

Negative 7% 6% 2% 1%

a) For a randomly selected person from this country, what is the probability that their blood type is

i) not A positive?

ii) B positive or AB?

iii) type O or Rh-positive?

b) Among 3 random blood donors, what is the probability (to 4 decimal places) that

i) all are type A?

ii) none of them are Rh-negative?

iii)at least one person is type O positive?

iv) the third donor only has blood type B?