SOLUTION: A particular department store knows from past experience that 18% of their customers have the store’s credit card. What is the probability that out of the next 100 customers that a

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Question 938812: A particular department store knows from past experience that 18% of their customers have the store’s credit card. What is the probability that out of the next 100 customers that at least 20% have the store’s credit card? (please express your answer using 4 decimal places)
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
p = .18 , z+=blue+%28x+-+mu%29%2Fsqrt%28blue%28p%281-p%29%2Fn%29%29
P(x ≥ .20) = P( z ≥ .02/sqrt(.18*.82/100)) = normalcdf(.5206, 100)