If you roll two number cubes, what is the probability of their sum being seven or higher?
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Parth (parthkohli):
I always keep this in my important files.
OpenStudy (anonymous):
I was going to draw that @ParthKohli ......... smart work
Parth (parthkohli):
Check how many total numbers you see, and then see how many 7's you see as well.
Parth (parthkohli):
Total numbers is also known as sample space, btw.
OpenStudy (anonymous):
whats the sample space?
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Parth (parthkohli):
The number of numbers you see in there.
Sample space is the total number of possibilities.
OpenStudy (anonymous):
so 36?
Parth (parthkohli):
Yeah! And now just see the number of 7's.
OpenStudy (anonymous):
6
OpenStudy (anonymous):
so do i divide them?
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OpenStudy (anonymous):
If you roll a pair of six sided number cubes the probability of rolling two numbers whose sum is 6 is 5/36 or 0.1389. There are 5 ways to get 6: 1,5 & 5,1 & 4,2 & 2,4 & 3,3. There are 36 outcomes for a roll of 2 dice.
OpenStudy (anonymous):
its 7 not 6
OpenStudy (anonymous):
yeah
OpenStudy (anonymous):
but it still dont make sense. none of those are an option. i tried 6/36
OpenStudy (anonymous):
and when reducing it i get 1/6 and thats not an option either