In a Poisson Probability Problem, the Rate of Errors Is

Multiple Choice

In a Poisson probability problem, the rate of errors is one every two hours. To find the probability of three defects in four hours,

A) μ = 1, x = 4.
B) μ = 2, x = 3.
C) μ = 3, x = 2.
D) μ = 3, x = 6.