A Company That Receives the Majority of Its Orders by Telephone

question 311

Multiple Choice

A 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 waiting
Time was found to be a variable best approximated by an exponential distribution with a mean
Length of waiting time equal to 2.8 minutes (i.e. the mean number of calls answered in a minute is
1/2) 8) . What proportion of callers is put on hold longer than 2.8 minutes?

• A) 0.3679
• B) 0.50
• C) 0.60810
• D) 0.6321

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Definitions:

Inner Ear

The innermost part of the ear, containing the cochlea and vestibular system, responsible for hearing and balance.

Vertigo

A sensation of spinning or feeling like one's surroundings are spinning, which can be a symptom of various disorders.

Tinnitus

A condition characterized by hearing noises in the ears when no external sound is present, often described as ringing, buzzing, or humming.

Hearing Loss

A partial or total inability to hear sound in one or both ears; can be caused by genetic factors, aging, exposure to loud noise, infections, or other health conditions.