Lesson 2

1. Turn to page 157 of the textbook and complete the questions for “Example 1.” Check your answer with the solution provided on page 158.
2. Answer “Build Your Skills” questions 1, 2, 3, 5, and 6 on pages 162 and 163 of the textbook. Answer

So far you have looked at experiments where the number of objects to pick from was always the same. In some scenarios the number of objects to pick from changes. For example, if you are passing around a box of chocolates, the number left to choose from changes as people pick their favourites. Complete the next activity to explore this idea.

Try This 5

An electrician’s tool belt holds a variety of tools, including 3 different sizes of Robertson screwdrivers, 5 different sizes of flat head screwdrivers, and 4 different sizes of Phillips screwdrivers. The electrician randomly takes one of the screwdrivers out to use.

1. What is the probability that the screwdriver is a Phillips screwdriver?
2. Assuming the screwdriver in question a. was a Phillips and was not replaced, what is the probability that the next screwdriver chosen is a Robertson?
3. Assuming that a Phillips and a Robertson have been taken out of the belt and not replaced, what is the probability that the next screwdriver chosen is a flat head?

Save your responses in your course folder.