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4thgraderhelp · Sep 17, 2007, 04:09 PM

I am not sure I remember how to do probability questions, my daughter brought home her excel math and there is a question that says... Natalie has a change purse full of coins. She has 13 pennies, 15 dimes and 22 nickels. If she takes a coin out of her purse, without looking, the probability that is will be a penny is ____ out of ____?? I have totally forgotten how to do these types of problems, please help:confused:

Meiling2316 · Sep 17, 2007, 04:23 PM

It would be 13 out of 50.

4thgraderhelp · Sep 17, 2007, 04:27 PM

Originally Posted by Meiling2316

It would be 13 out of 50.

Thanks but how did u get that answer?

nauticalstar420 · Sep 17, 2007, 04:30 PM

Add up the total number of coins : 13 + 15 + 22

The probability would be the number of pennies out of the total number of coins.

4thgraderhelp · Sep 17, 2007, 04:33 PM

Originally Posted by nauticalstar420

Add up the total number of coins : 13 + 15 + 22

The probability would be the number of pennies out of the total number of coins.

Thanks a bunch!!

nauticalstar420 · Sep 17, 2007, 04:34 PM

Originally Posted by 4thgraderhelp

thanks a bunch!!!

You're very welcome. :)

wonder-kitten · Oct 31, 2007, 01:27 PM

Originally Posted by 4thgraderhelp

I am not sure I remember how to do probability questions, my daughter brought home her excel math and there is a question that says...Natalie has a change purse full of coins. She has 13 pennies, 15 dimes and 22 nickels. If she takes a coin out of her purse, without looking, the probability that is will be a penny is ____ out of ____??? I have totally forgotten how to do these types of problems, please help:confused:

Hi, the answer to your question is...

1. add up 13, 15, and 22.
2. since there are 13 pennies, then the probility of her drawing a penny is 13 out of 50. (because 50 is what you get after adding 13, 15, and 22)

Glad to help,

Nicole