About 34 of Americans have type A blood A blood drive gets 1

About 34% of Americans have type A+ blood. A blood drive gets 180 donors and they need 50 with A+blood. What is the probability that they will not get enough A+donors?

Solution

P(A+ blood) = 0.34

Using Binomial Probability,

n =180

k =50

p =0.34

Probability that they will not get enough A+donors is when X<50 .

P(X<50) = 180C0 * (0.34 )^0 * (0.66)^180 +.....+ 180C49 * (0.34 )^49 * (0.66)^131

= 0.03 Answer