You can calculate the total number of people surveyed from a bar graph
To calculate the total number of people surveyed from a bar graph, follow these steps:
Step 1: Study the bar graph and identify the values given on the y-axis or the scale of the graph. This scale typically represents the number of people or the frequency of a particular category.
Step 2: Determine the value represented by each unit on the y-axis. For example, if each unit represents 10 people, and the y-axis scale starts from 0 and goes up to 50, then each bar in the graph represents 10, 20, 30, 40, or 50 people.
Step 3: Examine each bar in the graph and note down the value shown on the y-axis for each bar.
Step 4: Add the values obtained from each bar together to find the total number of people surveyed.
Let's consider a simple example:
Suppose the bar graph represents the number of people who responded to a survey based on age groups: 18-25, 26-35, 36-45, and 46-55. The y-axis scale represents the frequency.
The bar graph shows the following values on the y-axis:
- For the 18-25 age group: 20 people
- For the 26-35 age group: 30 people
- For the 36-45 age group: 15 people
- For the 46-55 age group: 25 people
To calculate the total number of people surveyed:
20 + 30 + 15 + 25 = 90
Therefore, the total number of people surveyed in this example is 90.