The class is the breadth, or range, of numbers we plan to put into each class of a frequency distribution using grouped quantitative data.

Width

Step-by-step explanation:

When we have quantitative data it is grouped in classes. There are three ways in which the data can be grouped they are:

Single value grouping where each class has one distinct value.

In Cutpoint grouping is used when the observations have decimal points

In Limit grouping a classes are set based on a specified range of values. Here limit grouping is being done and the range of each class is called width.

The correct answer is A
some scientific calculators have nPr button, you can enter 7 first then push shift (or 2nd) then nPr then 3, push= or enter
or you can use the formula nPr=n!/(n-r)!
7P3=7!/(7-3)!
=7!/4!=7•6•5•4!/4!
cancel 4!
then 7P3=7•6•5=210
note: the symbol ! means factorial
ex: 4!=4•3•2•1