First, we identify the even numbers in the list {2, 4, 5, 7, 9, 10, 12, 15, 18, 20}:
The even numbers are: {2, 4, 10, 12, 18, 20}
Now, let's count the total number of even numbers:
- There are 6 even numbers: 2, 4, 10, 12, 18, and 20.
Next, we find the total number of numbers in the list:
- There are 10 numbers in total.
Now we can calculate the probability of picking an even number:
\[ \text{Probability of getting an even number} = \frac{\text{Number of even numbers}}{\text{Total number of numbers}} = \frac{6}{10} \]
Now, we simplify the fraction:
\[ \frac{6}{10} = \frac{3}{5} \]
Thus, the probability of getting an even number is \(\frac{3}{5}\).