According to the 2021 population survey, which was conducted by the Statistics Bureau of South Africa (i.e. Statistics SA), 60% of the South African population 25 years old and above have completed a bachelor's degree or more.

Answer the following questions, given a random sample of 50 people (25 years old or above):

1. State the appropriate probability distribution for this scenario. (2)
2. What are the mean and the standard deviation of people who have completed their bachelor's degree? (3)
3. What is the probability that none of the students have completed their bachelor's degree? (2)
4. What is the probability that at least two of the students have completed their bachelor's degree? (3)