Answer (Assuming you are asking for the probability.):
75%
Explanation:
A, E, I, O, and U are the common vowels.
The word "Lieu" contains three vowels. (i,w,u)
Total number of preferred events: 3
There are 4 total letters.
Total number of events: 4
Convert into a percent:
There is a 75% chance that a vowel will be chosen when a letter is randomly picked from the word LIEU.