Question 1087848
use the binomial probability formula
:
Probability (P) ( k successes in n trials ) = nCk * p^k * (1-p)^(n-k), where
nCk = n! / (k! * (n-k)!)
:
P ( exactly 2 have type O blood out of 7 trials ) = 7C2 * (0.44)^2 * (1-0.44)^(7-2) = 0.2239 approx 0.22
:
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P of exactly 2 with type O out of 7 trials = 0.22
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