please give the answer in correct way show the working how they get answer step by step please because i do not understand this question show working all thank you so much please answer all thank you again please tell me what chapter is this i cannot understand how they get answer please help me please show full answer

Suppose that history shows that 60% of college students prefer Brand C cola. A sample of 5 students is to be selected. i. Find the probability that exactly 4 prefer brand C. (1 marks) ii. Find the probability that 2 or fewer prefer brand C. (4 marks) iii. Find the probability that at least 1 prefers brand C is (3 marks) iv. Calculate the mean and variance number that you would expect to prefer brand C. (2 marks) [Total: 10 marks]