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Exercises Probability and the bell curve

Example 3.16 from Statistics, 3.3 Two Basic Rules of Probability

(part 1)

a. What is the probability that the member is a novice swimmer?

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.

Solution
a. There are 150 members; 75 of these are advanced, and 47 of these are intermediate swimmers. So there are 150 − 75 − 47 = 28 novice swimmers. The probability that a randomly selected swimmer is a novice is $\frac{28}{150} .$

How did it go?

Previous (part 4)Next (part 2)

From Statistics (High school edition) by OpenStax (Rice University), section 3.3, licensed under CC BY 4.0. Original at openstax.org. We split the solution into steps; the words, numbers and figures are the book's. OpenStax doesn't endorse this site.