In an application to estimate the mean number of miles that downtown employees commute to work roundtrip each day, the following information is given: 
The point estimate for the true population mean is:
Definitions:
System Air Pressure Loss
The decrease in air pressure within a system, often due to leaks or inefficiencies, which can affect system performance.
Tractor-Protection Valve
A safety device in trucks that prevents air loss in the tractor if there's a leak in the trailer, ensuring the tractor's braking system remains functional.
Pressure Bleed Down
The process of gradually reducing the pressure in a system, often as a safety or preparatory step before maintenance or inspection.
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