In a city, 70% of the people prefer Candidate A. Suppose 30 people from this city were sampled.  Use the normal approximation to the binomial distribution to estimate: What is the probability that 80% or more of this sample will prefer Candidate A?  What is the probability that 45% or more of this sample will prefer some other candidate?

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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Chapter1: Starting With Matlab
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In a city, 70% of the people prefer Candidate A. Suppose 30 people from this city were sampled.

 Use the normal approximation to the binomial distribution to estimate: What is the probability that 80% or more of this sample will prefer Candidate A?

 What is the probability that 45% or more of this sample will prefer some other candidate?

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