Question
Write the number of students who scored 70 on a basic math test.
- 4
- 2
- 3
- 1
Hint:
The visual display of data (often grouped) in the shape of vertical or horizontal rectangular bars, with the length of the bars corresponding to the measure of the data, is called a bar graph. Here we have given a bar graph and we have to find the number of students who scored 70 on a basic math test.
The correct answer is: 3
Now we know that a graph is made up of vertices, or points, and edges, or lines connecting those vertices. Graphs come in a wide variety of forms in discrete mathematics.
The heights of the rectangular bars in a bar graph, which displays complete data, are proportionate to the values they indicate.
There are two types of a bar graph:
- Vertical Bar Graph
- Horizontal Bar Graph
Although the bars in bar graphs can be plotted either horizontally or vertically, the vertical bar graph is the one that is most frequently used.
Now we have given a bar graph which is a Vertical one. In that graph, there are 7 bars of score, 40, 50, 60, 70, 80, 90, and 100. We have asked the number of students who scored 70 on a basic math test
So from the graph, we can see that the bar of 70 is touching the y-axis at 3.
So 3 students scored 70 marks.
Here we used the concept of bar graphs and understood are different types of bar graphs. The number of students who scored 70 on a basic math test is 3. Although the bars in bar graphs can be plotted either horizontally or vertically, the vertical bar graph is the one that is most frequently used.
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