Histograms: # of Observations

The video tutorial explains the differences between bar graphs and histograms, focusing on how histograms display data in intervals without gaps between bars. It uses examples of tree heights and student study times to illustrate how to interpret data from histograms, calculate frequencies, and determine total observations.

What is a key difference between a bar graph and a histogram?

• A histogram uses numerical ranges on the horizontal axis.

• A bar graph uses numerical ranges on the horizontal axis.

• A histogram uses categories on the horizontal axis.

• A histogram has gaps between bars.

In the 'Height of Pine trees' histogram, what is the frequency of trees that are 3 to 4 feet tall?

• 60

• 30

• 10

• 50

How many trees in total were observed at the tree farm according to the histogram?

• 200

• 190

• 150

• 180

In the 'Time students spent studying' histogram, how many students studied for 11 to 15 hours?

• 35

• 30

• 15

• 10

What is the total number of students observed in the 'Time students spent studying' histogram?

• 120

• 130

• 110

• 100