The number of traffic accidents per day on a certain section of highway is thought to be Poisson distributed with a mean equal 2.19. Then the standard deviation of number of accidents is: A) 2.19 B) approximately 4.80 C) approximately 1.48 D) 3.14 E) (2.19)²

Question

Quizplus · Accepted Answer

For a Poisson distribution, the variance is equal to the mean. Therefore, the standard deviation is the square root of the mean, which in this case is approximately 1.48.

The Number of Traffic Accidents Per Day on a Certain