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Amayla has 70 red tiles, 50 blue tiles and 10 green tiles in a bag. She...

Amayla has 70 red tiles, 50 blue tiles and 10 green tiles in a bag. She pulls out 42 tiles one-at-a-time (and replaces it each time) and then counts to see how many of them are red.

a. Does this situation describe a hypergeometric or binomial distribution?

b. What is the probability that she pulled out exactly 20 red tiles?

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