Probability

Question

The probability that a person has type 0 blood is 38%..3 people picked at random...what's the probability at least one has type 0 blood

Answer 1

Chad,

         The probability that at least one person of the 3 has type O blood is equal to 1-prob that no one has type O blood.

 

P(not typ O) =1-.38=.62 and P(no type O out of 3)=.62³= .2383... so P(at least one)=1-.2383=.7616...

 

This assumes that the sample is drawn from a large population. At least one means 1, 2 or 3.

 

Hope this helps

 

Jim