Customers Arrive at a Carwash with on Average Once Every

question 29

Multiple Choice

Customers arrive at a carwash with on average once every 20 minutes. It seems likely that customer arrivals follow an exponential distribution. In a simulation, what formula would you use to estimate how long it will be until the next arrival occurs?

• A) = 20 + (20 − 0) × RAND()
• B) = NORM.INV(RAND(),20,3)
• C) = NORM.INV(RAND(),20,0)
• D) = 20 × LN(RAND())
• E) = − 20 × LN(RAND())