Interval and ratio data are called parametric data. Parametric data is used with a normal distribution only, because the data can be predicted. Nonparametric data does not assume a normal distribution. It can be predicted, but only with histograms and is not as reliable.
Interval data is measured along a scale. Ratio data is measured as a ratio, or the relationship between two numbers.
There are a few uses of normal distribution in business. Normal distributions can be used to predict how many products on a line might be defective, or how many employees might get sick, for example. It is also used in finance.