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A Level Statistics
Discrete Random Variables
Learn discrete random variables as part of work with data, probability models, distributions, hypothesis testing and large data set contexts.
Key idea
Look at the data type, choose an appropriate summary or diagram, then interpret the result in context.
What you will learn
Use discrete random variables meaning confidently.
Use discrete random variables representations confidently.
Use discrete random variables methods confidently.
Use discrete random variables applications confidently.
Success checklist
✓I can explain what discrete random variables means.
✓I can choose a suitable method without being told.
✓I can show clear working and check my answer.
Worked example
Find the mean of 4, 7, 9 and 10.
Step 1
Add the values: 4 + 7 + 9 + 10 = 30.
Step 2
There are 4 values.
Step 3
30 ÷ 4 = 7.5.
Answer
7.5
Quick practice
Question 1
Find the median of 3, 8, 4, 10, 5.
Question 2
Find the range of 11, 18, 23, 24.
Question 3
Describe positive correlation in a scatter graph.
Related resources
These are linked to the wider Statistics topic for now.