What does the Excel function =RAND() do?

What does the Excel function =RAND() do?

• A. Generates a random number from 0 up to, but not including, 1.
• B. Generates a random integer between 0 and 1
• C. Returns the standard normal value
• D. Generates a random number between -1 and 1

Answer: (A)

RAND returns a random real value between 0 (inclusive) and 1 (exclusive), drawn from a uniform distribution. This means you can get numbers like 0.237 or 0.999, but never exactly 1. It’s a handy building block in Monte Carlo work because you can scale or transform it to any range or distribution you need—for example, multiplying by a maximum value for 0 to max, shifting and scaling for negative values, or feeding it into inverse CDF functions to generate normally distributed values. The other descriptions—an integer between 0 and 1, a standard normal value, or a range from -1 to 1—don’t match what RAND actually produces.

RAND returns a random real value between 0 (inclusive) and 1 (exclusive), drawn from a uniform distribution. This means you can get numbers like 0.237 or 0.999, but never exactly 1. It’s a handy building block in Monte Carlo work because you can scale or transform it to any range or distribution you need—for example, multiplying by a maximum value for 0 to max, shifting and scaling for negative values, or feeding it into inverse CDF functions to generate normally distributed values. The other descriptions—an integer between 0 and 1, a standard normal value, or a range from -1 to 1—don’t match what RAND actually produces.