Spreadsheet task (Chart Creation):
Based on the daily patrol times, calculate the average patrol duration for each day and place it in a new "Average" column at the end of that day's row. Identify all durations strictly greater than the daily average and display them in red text. For each of these above-average durations, apply a soft orange fill to the corresponding start time, finish time, and duration cells.

In a new "Avg. Excess Duration" column (next to "Average"), calculate the average of only the above-average durations for that day.

Create a new sheet named "Graph Average Patrol Time" containing:

1. A helper table with dates as column headers and the following as row labels:
   - Date (in DD-MMM format)
   - Average Patrol Time
   - Ideal Average Time (constant 30 minutes)
   - Avg. Excess Duration
   - Count Above Average (count of durations exceeding the daily average)

2. A combo chart positioned below the helper table with:
   - Three line series (straight lines with markers):
     - Average Patrol Time (blue)
     - Ideal Average Time (orange)
     - Avg. Excess Duration (green)
   - One bar series on a secondary Y-axis:
     - Count Above Average (gray)

3. Chart title "Patrol Duration Overview" at top center, legend at bottom.
4. X-axis for dates, primary Y-axis for durations, secondary Y-axis for count.

Evaluation criteria:
description: The chart is a combo chart with both line series and bar series
description: The chart title reads 'Patrol Duration Overview'
description: The chart title is positioned at the top center of the chart
description: The legend is positioned at the bottom of the chart
description: The legend contains an entry labeled 'Count Above Average'
description: The legend contains an entry labeled 'Average Patrol Time'
description: The legend contains an entry labeled 'Ideal Average Time'
description: The legend contains an entry labeled 'Avg. Excess Duration'
description: The Average Patrol Time series is displayed as a line with markers
description: The Ideal Average Time series is displayed as a line with markers
description: The Avg. Excess Duration series is displayed as a line with markers
description: The Count Above Average series is displayed as bars
description: The Average Patrol Time line is blue in color
description: The Ideal Average Time line is orange in color
description: The Avg. Excess Duration line is green in color
description: The Count Above Average bars are gray in color
description: The X-axis displays dates
description: The chart has a primary Y-axis on the left side for durations
description: The chart has a secondary Y-axis on the right side for count
description: The X-axis displays 8 dates in order: 12-Jul, 13-Jul, 14-Jul, 15-Jul, 16-Jul, 17-Jul, 18-Jul, 19-Jul
description: The Ideal Average Time line is constant at 0:30 (30 minutes) across all dates
description: The Count Above Average bar for 12-Jul has a value of 4 on the secondary Y-axis
description: The Count Above Average bar for 13-Jul has a value of 4 on the secondary Y-axis
description: The Count Above Average bar for 14-Jul has a value of 3 on the secondary Y-axis
description: The Count Above Average bar for 15-Jul has a value of 4 on the secondary Y-axis
description: The Count Above Average bar for 16-Jul has a value of 6 on the secondary Y-axis
description: The Count Above Average bar for 17-Jul has a value of 7 on the secondary Y-axis
description: The Count Above Average bar for 18-Jul has a value of 8 on the secondary Y-axis
description: The Count Above Average bar for 19-Jul has a value of 7 on the secondary Y-axis
description: The Average Patrol Time line shows values between approximately 0:33 and 0:41 across all dates
description: The Average Patrol Time line is consistently above the Ideal Average Time line (0:30) for all dates
description: The Avg. Excess Duration line shows values between approximately 0:45 and 1:09 across all dates
description: The Avg. Excess Duration line is consistently above the Average Patrol Time line for all dates
description: The Avg. Excess Duration line peaks at approximately 1:09 on 14-Jul
description: The Average Patrol Time line shows a general declining trend from 13-Jul to 19-Jul
description: The Avg. Excess Duration line shows a declining trend from 14-Jul to 19-Jul
description: The Count Above Average bars show an increasing trend from 14-Jul (3) to 18-Jul (8)