1. From the past experience, a manager of a telecom store knows that 85% of his customer will use e-cash when buying mobile phones. Suppose 3 customers are in line to make a purchase.
2. Does this scenario satisfy the conditions of Bernoulli's process?
3. Construct a probability tree that delineates all possible values and their associated Probabilities
4. Using the probability tree, derive the binomial probability distribution.

The total probability rule is a useful tool for breaking the computation of a probability into distinct cases. Justify