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