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Example 3.16 from Statistics, 3.3 Two Basic Rules of Probability
c. What is the probability that the member is an advanced swimmer and practices four times a week?
Work it out on paper first. Then open the solution one step at a time, and stop as soon as you can finish on your own.
c. There are 40 advanced swimmers who practice four times per week, so the probability is
How did it go?