Louise Johnson
Junior Member
- Joined
- Jan 21, 2007
- Messages
- 103
Question:
Two unbiased dice are thrown once and the total score is observed. Find the probability that:
a) the total score is even or greater than 7
\(\displaystyle \L\\\frac{{18}}{{36}} + \frac{{15}}{{36}} - \frac{9}{{36}} = \frac{2}{3}\)
This one I used P(even or >7)=P(even)+P(>7)-P(even and >10)
b) the total score is divisible by 3 and greater than 7
\(\displaystyle \L\\\frac{{(2 + 5 + 4 + 1)}}{{36}} \bullet \frac{{(4 + 1)}}{{(2 + 5 + 4 + 1)}} = \frac{5}{{36}}\)
Thank you for your help
Sincerly
Louise
Two unbiased dice are thrown once and the total score is observed. Find the probability that:
a) the total score is even or greater than 7
\(\displaystyle \L\\\frac{{18}}{{36}} + \frac{{15}}{{36}} - \frac{9}{{36}} = \frac{2}{3}\)
This one I used P(even or >7)=P(even)+P(>7)-P(even and >10)
b) the total score is divisible by 3 and greater than 7
\(\displaystyle \L\\\frac{{(2 + 5 + 4 + 1)}}{{36}} \bullet \frac{{(4 + 1)}}{{(2 + 5 + 4 + 1)}} = \frac{5}{{36}}\)
Thank you for your help
Sincerly
Louise
