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Mathematics 22 Online
OpenStudy (anonymous):

helppp An experiment consists of rolling two fair dice and adding the dots on the two sides facing up. What is the probability that the sum of the dots is 10?

jimthompson5910 (jim_thompson5910):

have a look at this image http://amca01.files.wordpress.com/2011/05/2dice.jpg?w=320&h=300 Note: it's not my pic/drawing since I found it online somewhere

jimthompson5910 (jim_thompson5910):

and tell me if that helps or not

OpenStudy (anonymous):

it don help

OpenStudy (anonymous):

don't*

jimthompson5910 (jim_thompson5910):

does tcarroll010's explanation make sense then?

OpenStudy (anonymous):

whats the answer ? and it dont help

jimthompson5910 (jim_thompson5910):

the table attached shows all the possible outcomes of rolling two dice (and summing them up) tcarroll010 pointed out the only 3 ways to do this (one is 4,6...4 on the first, 6 on the second to get 4+6 = 10)

OpenStudy (anonymous):

come on quick its confusing

OpenStudy (anonymous):

wrongg its 1/12

OpenStudy (anonymous):

i know i did that

jimthompson5910 (jim_thompson5910):

yes you have to reduce 3/36 to get 1/12 always always always reduce but tcarroll010 wasn't giving you the answer as s/he was giving you steps leading up to the answer (so you would do some of it yourself)

jimthompson5910 (jim_thompson5910):

1/12 is the only one I would go for though since it's always a good idea to reduce

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