Histograms and Frequency Density: Constructing and Interpreting Data Distributions

The video tutorial explains how to draw histograms by calculating frequency density. It covers the steps to determine the range for each interval, compute frequency density, and draw the bars accurately on the histogram. The tutorial also provides insights into the marking scheme and offers tips for ensuring accuracy in calculations and graph plotting.

What is the range for the interval 50 to 100?

• 50

• 100

• 30

• 20

How do you calculate the frequency density for an interval?

• Add the frequency and range

• Divide the frequency by the range

• Multiply the frequency by the range

• Subtract the range from the frequency

What is the frequency density for the interval with a frequency of 90 and a range of 30?

• 2

• 3

• 4

• 5

If the range is 50 and the frequency density is 2.8, what is the height of the bar?

• 5.6

• 3.5

• 2.8

• 1.4

For a range of 200 and a frequency density of 0.7, what is the width of the bar?

• 100

• 150

• 250

• 200

How many marks are awarded for correctly calculating two frequency densities?

• 4 marks

• 3 marks

• 2 marks

• 1 mark

Why is it important to write down your frequency density calculations?

• To ensure the graph is colorful

• To double-check the graph's accuracy

• To avoid using a calculator

• To make the graph look complex