Final answer:
The number of candy bars per case cannot be determined without additional information. For a bar graph or pie chart, data should be organized by category, with bars representing frequencies or percentages, and the pie chart showing proportionate segments of a whole.
Step-by-step explanation:
To determine the number of candy bars in each case from the provided graph, we need a key piece of information, specifically the total number of cases sold by each of the four students and the total number of candy bars. Unfortunately, this critical piece of data is missing from the question as presented. Without this, we cannot calculate the number of candy bars per case. In general, however, if we had, for example, a student who sold 4 cases containing a total of 48 candy bars, we would divide the total number of candy bars by the number of cases to find the amount per case; in this case, 48 divided by 4 equals 12 candy bars per case.
To construct a bar graph, we would categorize and tally up information such as the number of students with birthdays in each season or the number of cars sold by salespersons in a week. For each category, we would then draw a bar that corresponds to the number of students or sales for that category. The height of each bar corresponds to the quantity (frequency) related to each category. When illustrating percentages, it's important to maintain a consistent scale for the bars to accurately represent the data.
When dealing with categorical data, a pie chart is often used because it shows the proportion of each category in a whole. For example, if we want to display the enrollment percentages at several schools, we would use a pie chart to show each school's share of the total. However, if absolute numbers and differences in sizes are more important than percentages, a bar graph would be more informative as it represents individual values that can be compared side by side.