Question 986110: Suppose in USA 30% of the workers take public transportation daily.
A. In a sample of 10 workers, what is the probability that exactly three workers take public transportation daily?
B. In a sample of 10 workers, what is the probability that at least three workers take public transportation daily?
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Suppose in USA 30% of the workers take public transportation daily.
A. In a sample of 10 workers, what is the probability that exactly three workers take public transportation daily?
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Ans:: P(x=3) = 10C3*0.3^3*0.7^7 = binompdf(10,0.3,3) = 0.2668
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B. In a sample of 10 workers, what is the probability that at least three workers take public transportation daily?
Ans: P(3<= x <=10) = 1 - binomcdf(10,0.3,2) = 0.0028
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Cheers,
Stan H.
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