Question

The end points of a frequency polygon are joined to the x axis. The first end point is ______.

Options

• lower limit of the first class

• the class mark of the class previous to the first class

• origin

• negative side of the origin

Answer 1

The end points of a frequency polygon are joined to the x axis. The first end point is the class mark of the class previous to the first class.

Explanation:

In a frequency polygon, the end points are connected to the x-axis by placing imaginary class marks before and after the first and last. To properly close the polygon, the first endpoint is the class mark of the class preceding the first class, which is obtained with frequency zero.