The Time Between Arrivals at an ATM Machine Follows an Exponential

Multiple Choice

The time between arrivals at an ATM machine follows an exponential distribution with θ = 10 minutes. Find the mean and standard deviation of this distribution.

A) Mean = 10, Standard Deviation = 100
B) Mean = 10, Standard Deviation = 3.16
C) Mean = 10, Standard Deviation = 10
D) Mean = 3.16, Standard Deviation = 3.16