Question

A concert organizer recorded the number of people in different age groups who attended a concert. She then created the following histogram:
Histogram with title Concert Attendance, horizontal axis labeled Age Group (year) with bins 0 to 19, 20 to 39, 40 to 59, and 60 to 79 and vertical axis labeled Number of People with values from 0 to 60 at intervals of 10. The first bin goes to 40, the second goes to 50, the third goes to 30, and the last goes to 20.

Which of the following statements best compares the height of the bars of the histogram?

There are more participants in the 0–19 age group than in the 40–59 and 60–79 groups combined.
There are more participants in the 20–39 age group than in the 40–59 and 60–79 groups combined.
There are twice as many participants in the 0–19 age group than in the 60–79 age group.
There are 3 times as many participants in the 60–79 age group than in the 20–39 age group.

Answer 1

This is the concept of statistics. The correct answer is:
There are twice as many participants in the 0-19 age group than in the 60-79 age group. This is because:
Number of participants in the age group 0-19 is 40 participants
Number of participants in the age group 60-79 is 20 participants.
From the above we see that the age group 0-19 is double the number of age group 60-79 years old. 
Therefore our answer is option C