In frequency distribution - - variable is considered at a time?

I fully agree with the answers been added by EXPERTS......................Thanks.

An example of a univariate (i.e. single variable) frequency table. The frequency of each response to a survey question is depicted.

However more than one variable frequency distributions can be considered.

find the lower and the upper limits for each class.the lower limit for every class is the smallest value in that class .and the upper limit for every class is the greatest value in the class