4th grade
posted by dk .
sylvester bowls once a week. this week he bowled four games. his scores were, 105 103 107 109
what is his average (mean) for the week? explain how you found your answer.
what is the median score for the week? explain how you found your answer.
what is the mode for his socres for the week? explain how you found your answer.
he rented shoes for $2.50 and paid $1.50 for each game. if he paid with a $10 bill, how much change did he receive?

I'll be glad to HELP you with these problems after you tell me what you know and what you don't know about their answers.
In other words, you make an effort, and we can then help you. 
i add first 107+105=212/2=106/2=53

i don't this is right or wrong

i don't no this is right or wrong

You need to add all four numbers first. Then divide the sum by 4 to find the mean.

424/4=106

Right! :)

this is all what about another one

This site shows you how to find the median and the mode.
http://www.purplemath.com/modules/meanmode.htm 
the median is 105 and 107
and i don't about mode 
The median is half way between 105 and 107  so the median is 106.
This set of numbers doesn't have a mode. All of the numbers are different.
How do you think you can solve the last problem? 
10.001.50=$8.50 he receive back
and my son did 2:50+1:50=4:00 then he subtract 10:004:00 =$6:00 he receive back 
He played 4 games. So we multiply 1.50 times 4 = $6.00.
He paid $2.50 to rent shoes.
$2.50 + $6.00 = $8.50
$10.00  8.50 = ? change 
10.008.50=$1.50

Right. :)

thank you very much for helping me and my son

You're very welcome.