Examples of what pupils should know and be able to do
In the population as a whole Pr(red hair in males) = 0.2 and Pr(red hair in females) = 0.24.
Given a school has 600 boys and 500 girls find an estimate for the number of red-haired pupils.
Probing questions
How can you work out the frequency for one of the events; for both events?
How do you combine the two frequencies?
What if pupils find this a barrier?
Ask pupils to explain the problem in terms of each event separately and then discuss how they can work out the frquencies before combining them.
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