Posted by **Jen** on Friday, July 22, 2011 at 4:55pm.

A simple dartboard has three areas… the main board has a radius of 11 inches, there is a circle with a radius of 5 inches, and the bullseye has a radius of 2 inches. What is the probability of a random dart landing inside the bullseye? Round to the nearest thousandth.

I believe it is 2/18 or 0.11?? Please help :(

- Math-probability -
**bobpursley**, Friday, July 22, 2011 at 5:09pm
No, you have to do this on the basis of area (which is proportional to radius^2)

pr(bullseye)=(2/11)^2

- Math-probability -
**Jen**, Friday, July 22, 2011 at 5:19pm
so it would be 0.0330??

- Math-probability -
**bobpursley**, Friday, July 22, 2011 at 6:45pm
I would have rounded to 0.00331

- Math-probability -
**Ms. Sue**, Friday, July 22, 2011 at 6:50pm
Rounded to the nearest thousandth -- wouldn't that be 0.033?

- Math-probability -
**Jen**, Friday, July 22, 2011 at 6:59pm
yes you are correct Ms. Sue, thank you both :)

- Math-probability -
**Ms. Sue**, Friday, July 22, 2011 at 7:04pm
You're welcome, Jen.

- Math-probability -
**Jen**, Friday, July 22, 2011 at 7:08pm
Oh i forgot to ask....would i use A=Pir^2?

- Math-probability -
**Damon**, Friday, July 22, 2011 at 7:30pm
You can use pi r^2 but since you are just taking ratios the pi will cancel.

4 pi/121 pi = 4/121

- Math-probability -
**Jen**, Saturday, July 23, 2011 at 11:24am
thank you Damon :)

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