Use the binomial distribution, with N=10, p=0.15 and, k based on the part of the problem you are doing.
It is believed that 15% of teenagers in England of the age of sixteen are smokers.
Suppose that 10 sixteen year olds are selected at random from the population.
1. What is the probability that exactly two of the ten smoke?
2. What is the probability that three of fewer of the ten smoke?
3. What is the probability that over half of the ten are non-smokers?
Could u please include working out. Thanks