Step by step
The question
Question: find the mean of 18, 22, 25, 19, 30, 21, 24, 20 and 46.
Mean of 18, 22, 25, 19, 30, 21, 24, 20, 46
The mean is the fair share.
We add them all, then share the total equally.
mean: add them all, then ÷ how many
1 Add them all
We add all the numbers, from left to right.
18 + 22 + 25 + 19 + 30 + 21 + 24 + 20 + 46
So the total is 225.
total = 225
2 Count them
Now we count the numbers.
There are 9.
how many = 9
3 Share equally
We share the total equally: 225 divided by 9.
mean = 2259
225 divided by 9 is 25.
mean = 25
4 Check
Let's check: if every number were 25, 9 of them would make 25 times 9.
That is 225, the total.
So it is right!
25 × 9 = 225
Let's look back.
First: add them all.
Then: count them.
Then: share equally.
Last: check.
Answer
mean = 25