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Jo has a drawer full of unmatched socks. The drawer contains 40 blue socks, 30 green socks, and 30 yellow socks. She pulls seven socks

Jo has a drawer full of unmatched socks. The drawer contains 40 blue socks, 30 green socks, and 30 yellow socks. She pulls seven socks from the drawer, and records the number of blue socks in the sample.

a) Is it reasonable to approximate this distribution with a normal distribution?

b) What is the probability that 3, 4, or 5 socks are blue?

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