In digital imaging, 'digital' refers to data represented in a discrete manner using binary code. Duration is quantitative continuous data, while the number of times per week is quantitative discrete data, and interest rates are quantitative continuous data.
When referring to digital imaging, the term digital means that the data is represented in a discrete manner, often by using binary code of ones and zeroes. This can be contrasted with analog data, which varies continuously. In digital signals like those in computers, transistors act as on-off switches, representing these discrete values.
Duration (amount of time) would therefore be considered quantitative continuous data, as it can be measured along a continuous scale without clear separations. Similarly, the number of times per week, while countable, is quantitative discrete data, since it can only take on separate, countable values. Interest rates charged on financial aid are also quantitative continuous, as they can vary in a continuous range.