Year 11
Core
Year 11
Core
Conditional probability from a two-way table
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Lesson details
Key learning points
- In this lesson, we will interpret two-way tables and find conditional probabilities from them.
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This content is made available by Oak National Academy Limited and its partners and licensed under Oak’s terms & conditions (Collection 1), except where otherwise stated.
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3 Questions
Q1.
There are 10 counters in a bag. 4 counters are green and 6 counters are blue. Two counters are selected at random. If you want to calculate the probability that both are green, what calculation should you do?
A
B
Q2.
There are 10 counters in a bag. 4 counters are green and 6 counters are blue. Two counters are selected at random. Calculate the probability that you get one of each colour.
B
C
Q3.
There are 10 counters in a bag. 4 counters are green and 6 counters are blue. Two counters are selected at random. Calculate the probability that you get at least one blue.
A
B
3 Questions
Q1.
The two-way table shows information about year 7 and 8 students and their participation in some school clubs. How do you find the total number of students?
Find the difference between the students in year 7 and the students in year 8 for each club in the table.
Multiply all the numbers in each row.
Q2.
The two-way table shows information about year 7 and 8 students and their participation in some school clubs. What is the probability that two students picked at random attend debate club?
A
C
Q3.
The two-way table shows information about year 7 and 8 students and their participation in some school clubs. What is the probability that two students picked at random attend chess club and one is in year 7 and the other in year 8?
A
B