21. Suppose that at a busy traffic junction, the probability p of an individual car having an accident is 0.0001. During a certain part of the day, 100 cars pass through the junction. What is the probability of two or more cars being involved in an accident within this period, to 4 decimal places?

40. All the following are attributes of a Poisson distribution EXCEPT

Hint: List the attributes of a Poisson distribution

47. For a Geometric distribution random variable, which of the equation is true:

Hint: State the Geometric distribution memoryless property