Statistics
Frequency tables, class marks, mean and median.
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A frequency table counts how often each value appears.
Look: Marks out of 50. Most students scored 20–30.
✏️ Your turn!
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1Most common shoe size above?
2How many students in the marks graph?
3Values 1, 2, 3 with counts 4, 3, 3. Mean?
! Careful!
✗Averaging 5, 6, 7, 8, 9 and ignoring how many people.
✓Weight each size by how many people wear it.
✗Gaps between bars for grouped data.
✓Bars touch for grouped data.
See the whole lesson on one page
A frequency table counts how often each value appears.
To find the mean from a table, multiply each value by how often it appears, add those up, and divide by the total count.
Think of it like thisA shoe shop counts how many people wear each size, so it knows which sizes to stock most.
Solved together
Shoe sizes: 5 (3 people), 6 (5), 7 (7), 8 (4), 9 (1). Find the mean size.
Multiply each size by how many people.
Divide the big total by the number of people.
135 ÷ 20 = 6.75
AnswerMean size 6.75.
Now practise it
Kanakku makes new questions on statistics every time. It shows the working and gives a hint when you are stuck.