Question

For the class intervals 18-19 through 23-24, the frequency polygon is extended to touch the x-axis at which class marks?

Options

• 18.5 and 23.5

• 18.0 and 24.0

• 17.0 and 25.0

• 17.5 and 24.5

Answer 1

The polygon is extended to the preceding class mark 17.5 and the succeeding class mark 24.5 so that the polygon starts and ends on the x-axis.