there is a promotion where the customer selects a ball from a ballot box if a...
there is a promotion where the customer selects a ball from a ballot box if a red one is selected not for the account. It is known that in the ballot box there are 99 black balls and a red one. There are ten people trained in the row. What is the probability? that two people win the promotion?
Homework Answers
Probability of selecting red one, p = 1/100 = 0.01
q = 1 - p
Number of people, n = 10
This is a case of binomial distribution. P(X) = nCx px qn-x
P(2 people win the promotion) = P(X = 2)
= 10C2 x 0.012 x 0.998
= 0.00415
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