SOLUTION: A survey found that 10% of Americans believe that they have seen a UFO. For a sample of 10 people, find each probability: a.. That at least 2 people believe that they have seen

Question 1127294: A survey found that 10% of Americans believe that they have seen a UFO. For a sample of 10 people, find each probability:
a.. That at least 2 people believe that they have seen a UFO
b.. That 2 or 3 people believe that they have seen a UFO
c.. That exactly 1 person believes that he or she has seen a UFO
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
Probability of 0 people is .9^10=0.3487
probability of 1 is 10*0.1*0.9^9=0.3874
probability of 2 is 10C2*0.1^2*0.9^8=0.1937
probability of 3 is 10C3*0.1^3*0.9^7=0.0574
at least 2 is 1- prob(0,1)=1-0.7361=0.2639
2 or 3 is 0.2511

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