Final answer:
The probability that a randomly selected person's birthday is not in May is 334/365.
Step-by-step explanation:
To find the probability that a randomly selected person's birthday is not in May, we need to determine the number of days in a year that are not in May and divide it by the total number of days in a year. Since May has 31 days, the number of days not in May is 365 - 31 = 334. Therefore, the probability is 334/365.