The length of time for one individual to be served at a cafeteria is a random variable having an exponential distribution with a mean of 4 minutes. what is the probability that a person is served in less than 2 minutes on at least 5 of the next 7 days?

The question is kind of confusing. if it's asking how many variations of answers can you give. then do 4^5 for your answer.this would be something like the first question could be a and the 2nd c or first b next c etc. if you can, ask the teacher for a better confirmation of what it's asking. if i'm assuming correctly what it's asking, it's 625 different variations.