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Mathematics, 06.03.2020 17:04 jess4kids

For each lecture, the professor chooses between white, yellow and purple chalk, independently of previous choices. Each day she chooses white chalk with probability 0.5, yellow chalk with probability 0.4, and purple chalk with probability 0.1.

a) What is the probability that over the next 10 days she will choose white chalk 5 times, yellow chalk 4 times, and purple chalk 1 time?

b) What is the probability that over the next 10 days she will choose white chalk exactly 9 times?

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