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Friday, November 25, 2005

Mr. Dixon's on eBay - How Trusted is He?

Mr. Dixon is in my classroom right now and he has a question he needs your help with.

His trust rating on eBay is 99.2%. Out of 122 transactions he's had, 121 people said he treated them well and he can be trusted.

Mr. Dixon wants to know when will his "trust rating" reach 99.3% and he needs your help.

(1) Can you write an equation he can use to solve this problem?
(2) Can you solve the equation and tell Mr. Dixon how many more favourable exchanges he needs to have to raise his trust rating to 99.3%.

All of my classes are working on this. The first student in each class who solves Mr. Dixon's problem correctly gets a chocolate bar. ;-)


At 11/25/2005 5:29 PM, Blogger GraemeW said...

This comment has been removed by a blog administrator.

At 11/28/2005 8:13 AM, Blogger GraemeW said...

Alright here's my take on this problem.
121+x/122+x = 0.993
121+x = 121.146 +0.993x
0.007x = 0.146
x = 20.8571
then you round up to ones
x = 21
So he needs twenty one good ratings more with no bad ratings to achieve a rating of 99.3%
By the way I like Aero and Caramilk :-)


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