Math Pre-Test #2

3. Julie buys a book, a game, a puzzle, and a piece of computer software at the book fair. The computer software cost $10. Julie claims that the average price of the items she bought is $2.50. Can she be correct? Why or Why not.

The items Julie bought cannot have an average of $2.50 because one of her items costs $10, and all her items would have to be $0 for this to be possible.

If Julie's items were to have an average of $2.50, the computer software's price would have to decrease.

FOR EXAMPLE :

The book costs $2.50*

The game costs $1.50*

The puzzle costs $1.00*

The computer software costs $5.00*

Data: $2.50 + $1.50 + $1.00 + $5.00 = $10.00/4 = $2.50 <-- MEAN/AVERAGE

The sum of all data ^^ divided by the amount of data, (4), equals $2.50, (average price).

-CJ P. 8-17

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## 1 comment:

Great Answer!!

Harbeck

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