**Problem**: A certain population is made up of 80% Mexican Americans.Select a jury of 12.Find the mean and standard deviation.

**Problem Link**: <https://youtu.be/4Ew60JEPGUk?list=PL5102DFDC6790F3D0&t=865>

The instructor assumes success as selecting a Mexican American.So the problem boils down to calculating the expected no of successes i.e if X is a random variable representing the number of successes then we have to find 
$E(X)$.

According to my understanding, we can use binomial distribution only if the trials are independent but in this problem selecting a person from the population changes one of the amounts and hence the probability of success so how is it feasible to apply binomial distribution here? Let me know if I'm not clear.