A Catalog Company That Receives the Majority of Its Orders

question 104

Multiple Choice

A catalog company that receives the majority of its orders by telephone conducted a study to determine how long customers were willing to wait on hold before ordering a product. The length of time was found to be a random variable best approximated by an exponential distribution with a mean equal to 3 minutes. What proportion of customers having to hold more than 4.5 minutes will hang up before placing an order?

• A) 0.22313
• B) 0.48658
• C) 0.51342
• D) 0.77687

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Definitions:

Meninx

A term referring to any of the three membranes that cover the brain and spinal cord, including the dura mater, arachnoid mater, and pia mater.

Epidural Space

The area between the dura mater and the vertebral wall, containing fat and small blood vessels, often targeted for epidural anaesthesia.

Dura Mater

The outermost and toughest layer of the three membranes (meninges) that cover the brain and spinal cord.

Anesthesia

Anesthesia refers to a range of procedures that are used to prevent pain during surgery, which can be either local, regional, or general.