SOLUTION: In a study of brand recognition, 90% of consumers recognize coke. In a sample of 20 customers, find the probability that: a. exactly 18 bcustomers will recognize Coke. b. at leas

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Question 855304: In a study of brand recognition, 90% of consumers recognize coke. In a sample of 20 customers, find the probability that:
a. exactly 18 bcustomers will recognize Coke.
b. at least 18 customers will recognize Coke.
c. at most 18 customers will recognize Coke.
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

p = .90, n = 20

P(x = 18) = binompdf(20,.90,18) = .2852

P(x ≥ 18) = 1 - binomcdf(20,.90, 17) = .6769

P(x ≤ 18) = binomcdf(20,.90, 18) = .6083