Random numbers selected from a table should never be used to represent units of time.

• A. Sometimes
• B. True
• C. Not applicable
• D. False

Answer: (D)

Random numbers are a practical tool for modeling timing variability. When you need to represent how long a task or event lasts, you can map a random value to a time duration using a chosen probability distribution. This is the basis of Monte Carlo simulations and stochastic planning—you generate a random number and transform it into a time value that reflects how the process behaves in reality. Because you can choose the distribution and shape of the timing, using random numbers to represent units of time is not inherently inappropriate; it’s a legitimate technique in many applications. That’s why the statement is not correct: there are scenarios where random numbers are used to determine time intervals, such as simulating service times, wait times, or maintenance windows. The term “sometimes” captures the idea that it depends on the modeling goal, whereas saying it should never be done is an overgeneralization.