The binomial probability formula is the result of getting exactly k successes in n number of trials.
P(k success in n trials)=(nk)pk(1−p)n−k We have that
n=10,p=0.3 1.1 At least 2 will have a medical aid
P(X≥2)=1−(P(X=0)+P(X=1))=
=1−(100)0.30(1−0.3)10−0−(101)0.31(1−0.3)10−1≈0.850692 1.2. More than 9 will have a medical aid
P(X>9)=P(X=10)=(1010)0.310(1−0.3)10−10≈0.000006
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