SOLUTION: Please solve this question Suppose the mortality rate for a certain disease is 0.1 and suppose 10 people in a community contract the disease. what is the probability that(1) non w

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Question 529946: Please solve this question
Suppose the mortality rate for a certain disease is 0.1 and suppose 10 people in a community contract the disease. what is the probability that(1) non will survive (2) 50% will die (3) at least 3 will die.
Answer by stanbon(75887) About Me  (Show Source):
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Please solve this question
Suppose the mortality rate for a certain disease is 0.1 and suppose 10 people in a community contract the disease. what is the probability that:
Binomial Problems with n = 10 and p(die) = 0.1 and p(survive) = 0.9
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(1) none will survive
P(x = 0) = 0.1^10 = 1x10^-10
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(2) 50% will die
P(x = 5) = 10C5(0.1)^5*0.9^5 = 0.0015
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(3) at least 3 will die.
P(3<= x <=10) = 1 - P(0<= x <=2) = 0.0702
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Cheers,
Stan H.
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