An example of a quantitative variable is the

Time taken to complete a task is a quantitative variable, measured as a numerical amount.

It can be recorded in seconds or minutes and supports arithmetic operations.

Date of birth functions as a label or category rather than a measured quantity.

Highest educational qualification is an ordered category and thus not truly quantitative.

Postal code is a numeric label with no measurable magnitude behind its digits.

Quantitative variables permit means and standard deviations, unlike categorical ones.