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It has been estimated that 65% of all computers being used in classrooms are Macs. A...

It has been estimated that 65% of all computers being used in classrooms are Macs. A random sample of 300 classrooms is selected and the number of Macs is counted. What is the probability the sample proportion is off by at least 2% from the estimated proportion?

Math   Statistics-And-Probability   
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Answer #1

Mean=n*p=300*0.65=195

Standard dev =(n*p*q) ^0.5 = (300*0.65*0.35)^0.5 = 8.26

P(189<x<201)

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