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Suppose you there's a study on the impact of chemicals in drinking water on the health of citizens in a small town of 1000 people:

  1. Suppose you there's a study on the impact of chemicals in drinking water on the health of citizens in a small town of 1000 people: 490 males, 510 females; 300 younger than 20 and 100 older than 75. 400 people are working. Every person has a unique identifier, and you randomly select 3 people to be tested. Calculate the following probabilities:

a. P(all people drawn are male)

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