Frequency table of 1, 2, 2, 3, 1, 2, 4, 2

Step by step

The question

Question: make a frequency table of 1, 2, 2, 3, 1, 2, 4 and 2.

The frequency of a number is how many times it comes.

1 List the values

We write each value once, smallest first: 1, 2, 3 and 4.

2 Tally

Careful!

Cross out each number as you count it.

Then none is missed, and none is counted twice.

The first number is 1.

We cross it out, and put one mark next to 1.

Next is 2: one mark next to 2.

And so on: one mark for each number.

Every number is crossed out.

So every number has its mark.

3 Count

1 has 2 marks: f = 2.

2 has 4 marks: f = 4.

3 has 1 mark: f = 1.

4 has 1 mark: f = 1.

4 Check

Let's check.

We add the f column: 2 + 4 + 1 + 1 = 8.

There are 8 numbers in the list.

Every one is counted.

So it is right!

Let's look back.

First: list the values.

Then: tally.

Then: count.

Last: check.