Question

Consider the type of clothes dryer (gas or electric) purchased by each of five customers at a certain store. A. If the probability that at most one of these purchases an electric dryer is 0.428 what is the probability that at least two purchase an electric dryer?

Answer 1

Let event E = the event that at most one customer purchases an electric dryer (1 or 0 customer). Then E' is the event that at least two purchase electric dryers (2 or 3 or 4 or all 5 purchase an electric dryer)P(E′) = 1 – P(E) = 1 - .428 = .572