Statistics Practice: Conditional Probabilities from Counts

Statistics Practice: Conditional Probabilities from Counts

Choose one exact numerical answer in the unit requested. Fractions such as 3/2 mean an exact value; no rounding unless requested. All 20 questions appear in random order. Practice target: 16/20. These are focused mathematics exercises, not a complete examination.
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In a club, 6 of the 15 members who play chess also play tennis. A chess player is chosen uniformly at random. What is the probability that this member plays tennis?