Question

Let's say the three sections of this course have 50, 70, and 80 students, respectively. We randomly pick one student, and everyone in the same section as that student gets a candy bar. What's the expected number of candy bars we'd give out?

Answer 1

here we have 50,70,80 students

which is a total of 200 students

probability of chosing section A[50 students] = 50/200 = 5/20

probability of chosing section B[70 students] = 70/200 = 7/20

probability of chosing section C[80 students] = 80/200 = 8/20

since the probability of picking the student of section C is most hence the probability of distributing 80 candies is the most.

So the expected value of candies we need to distribute is 80