Frequency Polygons and Class Intervals

The video tutorial explains how to draw a histogram and frequency polygon for a given frequency distribution. It covers the steps to set up class intervals, draw axes, set scales, plot histogram bars, and construct a frequency polygon. The tutorial also includes details on calculating midpoints and handling preceding and succeeding classes with zero frequency.

What is the first step in drawing a histogram for a given frequency distribution?

• Calculate the mean of the data

• Identify the class intervals and their frequencies

• Find the mode of the data

• Draw the frequency polygon

Which of the following is a correct class interval from the given distribution?

• 15 to 20

• 10 to 20

• 0 to 5

• 30 to 35

What is the frequency for the class interval 20 to 25?

• 30

• 20

• 10

• 40

What is the intersection point of the x-axis and y-axis called?

• Base

• Midpoint

• Vertex

• Origin

On the x-axis, what does one centimeter represent?

• Ten frequencies

• Five frequencies

• Ten classes

• Five classes

What is the frequency for the class interval 25 to 30?

• 20

• 10

• 30

• 40

What is the purpose of adding a preceding and succeeding class with zero frequency?

• To balance the data

• To extend the frequency polygon

• To calculate the mean

• To find the mode

What is the midpoint of the class interval 5 to 10?

• 12.5

• 10

• 7.5

• 5

How is the frequency polygon formed?

• By finding medians

• By calculating averages

• By connecting midpoints

• By drawing bars

What is the frequency at the midpoint of the class interval 15 to 20?

• 15

• 40

• 20

• 30