A 20-sided die with sides labeled with the letters A through T is rolled. What is the probability the letter facing up is a vowel? Express your answer as a common fraction.
A-T= Total of 20 letters
Vowels from A-T= A,E,I,O
So, we have 4 vowels and 20 total letters.
Thus, \(\frac{4}{20}=\boxed{\frac{1}{5}}\)