Of the pupils in a school, 30% travel to school by bus. From a sample of 10 pupils chosen at random, what is the probability that more than 8 travel by bus?

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Nathen Wilkerson · Accepted Answer

Step 1  We have a binomial probability. I like to start these kinds of questions with this relation:  ∑k=0nCn, k(p)k(1−p)n−k=1  We have n=10, p=0.3 adn are looking at 8&amp;lt;k≤10  C10, 9(0.3)9(0.7)1+C10, 10(0.3)10(0.7)0≈0.00014

Of the pupils in a school, 30% travel to school by bus. From a sample...

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