Question

5) Suppose that 40% of U.S. voters are Democrats. What is the probability that in a sample of 200 voters that at least 90 people will be Democrat?

Answer 1

Let X is random variable that counts number of democratic voters.then X will follow binomial distribution with parameters n and p.

Given p= ​​​​0.40

n= 200

Heree sample size is is large enough. so we can approximate binomial distribution to normal distribution

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