How do you determine the row of the random number selected by a calculator?

• A. Multiply the number by 100 and round
• B. Multiply the number by 500 and round to the nearest whole number
• C. Multiply the number by 1000 and round down
• D. Divide the number by 500

Answer: (B)

To determine the row of the random number selected by a calculator, multiplying the number by 500 and rounding to the nearest whole number is the correct approach because it effectively scales the random number to fit within the range of row identifiers.

Random numbers generated by calculators typically range between 0 and 1. By multiplying this number by 500, you convert it to a range of 0 to 500. Rounding to the nearest whole number then allows you to obtain a valid integer that corresponds to a row number. Since most structured datasets or tables have row indices that are whole numbers, this method ensures the random number can be interpreted correctly in the context of row identification.

The other methods do not appropriately align with this requirement. For instance, multiplying by 100 or 1000 could result in values that do not fit the intended range needed for row selection, while dividing by 500 would not yield appropriate row identifiers within the context needed for selection. Therefore, the approach of multiplying by 500 and rounding provides the necessary conversion to determine the corresponding row accurately.