# Normalization of data

#### Klaas van Aarsen

##### MHB Seeker
Staff member
Hello, please help me with this problem. The question is in the picture. I don't know how to normzalize the data. How to know which method should be used? I need two methods of normalization here. HELP!
View attachment 1755
Hi aruwin! Two different normalization methods might be:
1. Approximate with a normal distribution.
Subtract the mean, and divide the result by the standard deviation.
2. Scale to the same range.
For instance by dividing each score by the highest one.

#### aruwin

##### Member
Hi aruwin! Two different normalization methods might be:
1. Approximate with a normal distribution.
Subtract the mean, and divide the result by the standard deviation.
2. Scale to the same range.
For instance by dividing each score by the highest one.

Thanks for replying but could you please tell me why do you pick those two methods? And tell me how to use them.

#### Klaas van Aarsen

##### MHB Seeker
Staff member
Thanks for replying but could you please tell me why do you pick those two methods? And tell me how to use them.
Well, we need to combine the different categories numerically.
For that they have to be "normalized", that is, they need to have a similar range.
I'm just mentioning 2 methods to do it.

How to use it?
Well, for method 1, do you know how to calculate a mean? And a standard deviation?
And for method 2, what do you get if you divide each price by the highest price?