Question

Mr. Swart is sometimes able to find one of the fun electric scooters near his apartment complex to rent for his morning commute。Each day，there is an 80％chance he finds an electric scooter，and a 20％chance he is utterly disappointed and has to walk or take the bus。He goes to work five days each week，and whether he is able to find a scooter one day does not affect whether he is able to find a scooter another day。

What is the probability Mr. Swart will be utterly disappointed and unable to find a scooter at least three days in one work week？Round your answer to four decimal places。

Answer 1

Givne n = 5 and p= P(he has to walk or take the bus) = 0.20

Using Binomial distribution,

The probability Mr. Swart will be utterly disappointed and unable to find a scooter at least three days in one work week is