People with type Onegative blood are universal donors donors

People with type O-negative blood are universal donors donors, what is the probability that none of them arc universal donors? at least one is a universal donor?

Solution

a)

The probability that one is not a universal donor is 1 - 0.07 = 0.93.

Thus,

P(0 universal) = 0.93^8 = 0.55958181 [ANSWER]

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b)

P(at least one) = 1 - P(0)

= 1 - 0.55958181

= 0.44041819 [ANSWER]