On question 19 how did you get 10 -5? A random sample of 250 voters is chosen fr

Question

On question 19 how did you get 10 -5? A random sample of 250 voters is chosen from a list of 10,000 registered voters. Let X be the number who support the incumbent mayor for reelection. In Exercises 17-26, determine the indicated probability for a binomial experiment with the given number of trial n and the given success probability p. n = 5, p = 0.7, P(3) n = 10. p = 0.2, P(1) n = 20, p = 0.6, P(8) n = 14, p = 0.3, P(8) n = 3, P = 0.4, P(0) n =6, p = 0.8, P(6) n = 8, p = 0.2, P(Fewer than 3) n =15, p = 0.9, (14 or more) n =50, p = 0.03, (2 or fewer) n =30, p = 0.9, (more than 27) Working with the Concepts Take a guess: A student takes a true-false test that has 10

Explanation / Answer

Lets do 19 number

Here n=20 and p=0.6 and x=8

Now P(X=x)=ncx*px(1-p)n-x

putting values we get

P(X=8)=20c8*0.680.412=0.0355

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