The answer in percentage is %55
The total amount of balls is 20. Half of them are odd, but also we need to add the probability of picking the 4.
Then,
[tex]\begin{gathered} 20\cdot\frac{1}{2}=10 \\ 10+1=11 \end{gathered}[/tex]So of the 20 possible outcomes, we want to know the probablity of 11 of them. That's a probability of 11/20. Thus,
11/20 = 0.55
To convert the result in percentage, we multiply by 100:
0.55 * 100 = %55
