If the mean waiting time for the next arrival is 18 minutes,what is the first quartile (25th percentile)for waiting times?
A)13 minutes
B)7.9 minutes
C)5.2 minutes
D)3.1 minutes

Question

Quizplus · Accepted Answer

The waiting time follows an exponential distribution with a mean of 18 minutes. The first quartile (25th percentile) can be calculated using the formula: Q1 = -mean * ln(1-0.25) = -18 * ln(0.75) ≈ 5.2 minutes.

If the Mean Waiting Time for the Next Arrival Is