26. An average of Answer Question 26[input] hours of free time were spent using screens in 2015.

Question

BlackTom AI · Accepted Answer

Locate 2015 on the horizontal axis of the chart and read the corresponding screen-use value on the vertical axis: 4 hours.

1. Relevant knowledge points and concepts
- Reading a time-series or bar/line chart requires identifying the independent variable (year) on the horizontal axis and the dependent variable (hours of free time using screens) on the vertical axis. 
- Ensure units are understood (hours) and use tick marks or gridlines to determine exact values. If the plotted point falls between ticks, interpolate proportionally.

2. Step-by-step reasoning process
- Step 1: Find the year 2015 along the x-axis. 
- Step 2: Identify the data series labeled for “using screens” (the screens line or bar). 
- Step 3: Follow from the 2015 mark vertically up to the screens data point or top of the bar. 
- Step 4: Read horizontally from that point to the y-axis to find the numeric value in hours.

3. Calculations / intermediate steps
- In this case the data point for 2015 aligns exactly with the y-axis tick labeled 4. No interpolation or arithmetic is required. If it had fallen between 3 and 5 at the halfway point you would calculate (3 + 5)/2 = 4, but here the plotted value equals the tick value 4.

4. Why the correct answer is correct
- The chart’s plotted value for screens in 2015 corresponds exactly to the 4-hour mark on the vertical axis. That direct reading is the definitive measurement provided by the graph.

5. Why other possible answers would be incorrect
- Answers such as 3 or 5 would result from misreading the graph (reading the wrong tick or a different data series). Because the plotted point aligns with 4, any other number contradicts the visual data.

6. Conclusion
- Therefore, the average number of hours of free time spent using screens in 2015 is 4, which matches the provided answer.

26. An average of Answer Question 26[input] hours of free time were spent using screens in 2015.简答题

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