3/8 would be the answer because 1/4 is a quarter and to add it to 1/8 you need to make it 2/8.
2/8 + 1/8 = 3/8.
1/2+1/8=2/10
4/8+1/8=5/8
so you answer is 5/8 and 2/10
![Pr(Cat\ and \ Dog) = 0.50](/tpl/images/1342/9995/730fa.png)
Step-by-step explanation:
Given
![Total = 300](/tpl/images/1342/9995/d9a9f.png)
![Cat\ and\ Dog = 150](/tpl/images/1342/9995/30b57.png)
See attachment
Required
![Pr(Cat\ and \ Dog)](/tpl/images/1342/9995/69cdc.png)
This is calculated as:
![Pr(Cat\ and \ Dog) = \frac{n(Cat\ and \ Dog)}{Total}](/tpl/images/1342/9995/0b0f1.png)
This gives
![Pr(Cat\ and \ Dog) = \frac{150}{300}](/tpl/images/1342/9995/89626.png)
![Pr(Cat\ and \ Dog) = 0.50](/tpl/images/1342/9995/730fa.png)