Which of the following is NOT one of the forms of frequency distributions?

In the context of frequency distributions, continuous refers to a type of data rather than a type of frequency distribution. Frequency distributions categorize data points into intervals or categories to show how often each occurs, and continuous data is more of a measurement rather than a distribution form itself.

Bimodal and skewed are characteristics of distributions, indicating the shape and behavior of the data collected. A bimodal distribution has two different modes or peaks, while a skewed distribution is one that is not symmetrical, leading to one tail being longer than the other. Nominal, on the other hand, refers to a type of categorical data that can be distributed in a frequency table but does not have a specific order.

Thus, since continuous is not a form of frequency distribution but describes a type of data, it is the correct answer to the question posed.