Final answer:
The probability of randomly selecting a vowel from the given phrase 'robert likes to eat tacos at chipotle' is 13/38.
Step-by-step explanation:
To find the probability of selecting a vowel from the phrase, we need to determine the number of vowels in the phrase and the total number of letters. In the given phrase, 'robert likes to eat tacos at chipotle,' there are 13 vowels (o, e, i, e, o, a, o, a, i, a, o, a, o) and a total of 38 letters. Therefore, the probability of selecting a vowel is 13/38.