SOLUTION: A previous survey shows that some 60% of customers prefer brand X. A sample survey is made of 75 customers, what is the probability that more than 70% of the customers do indeed pr

Question 889376: A previous survey shows that some 60% of customers prefer brand X. A sample survey is made of 75 customers, what is the probability that more than 70% of the customers do indeed prefer brand X?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A previous survey shows that some 60% of customers prefer brand X. A sample survey is made of 75 customers, what is the probability that more than 70% of the customers do indeed prefer brand X?
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z(0.7) = (0.7-0.6)/sqrt[0.6*0.4/75] = 1.77
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P(p > 0.7) = P(z > 1.77) = 0.0385
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Cheers,
Stan H.
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