View Full Version : Probability prob
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
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
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
thanks a bunch!!!
You're very welcome. :)
wonder-kitten
Oct 31, 2007, 01:27 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:
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