Service Times at a Doctor's Office Take an Average of 40

Multiple Choice

Service times at a doctor's office take an average of 40 minutes. It seems likely that service times follow an exponential distribution. In a simulation, what formula would you use to estimate how long the next service will take?

A) = 40 + (40 − 0) × RAND()
B) = NORM.INV(RAND() ,40,4)
C) = NORM.INV(RAND() ,40,0)
D) = − 40 × LN(RAND() )
E) = 40 × LN(RAND() )