Of the pupils in a school, 30\% travel to school



Answered question


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?

Answer & Explanation

Nathen Wilkerson

Nathen Wilkerson

Beginner2022-02-15Added 4 answers

Step 1
We have a binomial probability. I like to start these kinds of questions with this relation:
k=0nCn, k(p)k(1p)nk=1
We have n=10, p=0.3 adn are looking at 8<k10
C10, 9(0.3)9(0.7)1+C10, 10(0.3)10(0.7)00.00014

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