Final answer:
The probability that a randomly chosen person from the survey prefers regular or plain coffee is 0.27.
Step-by-step explanation:
The question you've asked pertains to the calculation of probability from a given table of coffee preferences. Specifically, you want to find the P(regular or plain), which means the probability that a randomly chosen person prefers either regular coffee or plain coffee, or both.
According to the table, the probability of choosing someone who prefers regular and plain coffee is 0.27. Since there are no other categories that include both 'regular' and 'plain', this is the probability we are looking for.
So, the probability that a person chosen at random prefers regular coffee or plain coffee is 0.27.