Final answer:
To show exact values for a data series in a bar chart, you should display the data labels for each bar.
Step-by-step explanation:
To show exact values for a data series in a bar chart, you should display the data labels for each bar. Data labels provide the exact values for each category, making it easier for viewers to interpret the chart accurately. The labels can be placed above or inside each bar, depending on the design and readability of the chart.