help with calculating z-score.

Hello guys,

I have the answer here and need explanation on coming to terms with it. The question,

5000 apartments sold in a certain area and the mean price is $459,000 and the standard deviation is $76000. A particular apartment has a z-score of 3.78. What did it sell for? – The formula to calculate z-score is (x -mean) / standard deviation. The answer that I have from the text book is $459,000+3.78*76,000=$746,280… but why?

I've been punching in the numbers into the calculator and do not get $746,280.

Any help is appreciated.

Regards

Re: help with calculating z-score.

BASIC MATH IDIOT MISTAKE... I should have did the multiplication before the addition.

Quote:

Originally Posted by

**schia** Hello guys,

I have the answer here and need explanation on coming to terms with it. The question,

5000 apartments sold in a certain area and the mean price is $459,000 and the standard deviation is $76000. A particular apartment has a z-score of 3.78. What did it sell for? – The formula to calculate z-score is (x -mean) / standard deviation. The answer that I have from the text book is $459,000+3.78*76,000=$746,280… but why?

I've been punching in the numbers into the calculator and do not get $746,280.

Any help is appreciated.

Regards