Final answer:
The estimated percentage of idle time for the air-express cargo loaders is calculated using the number of idle observations over the total observations multiplied by 100, resulting in 16.00% after rounding to two decimal places.
Step-by-step explanation:
To calculate the estimated percentage of idle time, you would use the following formula:
Percentage of Idle Time = (Number of Idle Observations / Total Observations) × 100%
Substituting the given values:
Percentage of Idle Time = (8 / 50) × 100% = 16%
After rounding to two decimal places, the estimated percentage of idle time is 16.00%.