## A community for students. Sign up today

Here's the question you clicked on:

## anonymous 2 years ago Two fair dice were rolled once. (a) What is the probability of getting a sum of 7? (b) What is the probability of getting a sum greater than 7? (c) Using (a) and (b), what is the probability of getting a sum less than 7?

• This Question is Closed
1. anonymous

@marigirl

2. AkashdeepDeb

Alrighty! Do you know what a sample space is?

3. anonymous

no

4. AkashdeepDeb

|dw:1389785917308:dw|

5. AkashdeepDeb

I'll help you solve the second question! If you see, they ask how many are greater than 7. Let's see, 6,2 5,3 4,4 3,5 2,6 6,3 5,4 4,5 3,6 6,4 5,5 4,6 5,6 6,5 6,6 And that is 15 possibilities out of a total 36. So Probability = $$\frac{Possible Outcomes}{Total Outcomes} = \frac{15}{36} = \frac{5}{12}$$ Now I guess you can do the first and the third one similarly! Got it? :D

6. anonymous

The third one = 1 - (a) - (b)

7. marigirl

Yes I agree with the ans, kryton1212 does that make sense?

8. anonymous

thanks all

#### Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy