SOLUTION: Based on past experience, 45% of all customers at Cooper’s Automotive Store pay for their purchases with a credit card. If a random sample of 260 customers is selected, what is t

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Question 1176376: Based on past experience, 45% of all customers at Cooper’s Automotive Store pay for their purchases with a credit card. If a random sample of 260 customers is selected, what is the probability that:a)at least 100of the customers pay with a credit card.b)less than 125of the customers pay with a credit card.c)between 91and 112of the customers, inclusive, pay with a credit card
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!

Hi
Binomial Distribution:   p = .45  q = .55   n = 260
Using Calculator(either TI or similarly inexpensive Casio fx-115 ES plus 
a) P( x ≥ 100)= 1 - P(x ≤ 99) = 1 -.0142 = .9858

b) P( x < 125) = P(x ≤ 124) = .8252

c) P( 91 < x < 112) = P(x ≤ 111) - P( x ≤ 91) = .2469 - .0007 = .2462

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