Some Marathons Allow Two Runners to "Split" the Marathon by Each

question 53

Multiple Choice

Some marathons allow two runners to "split" the marathon by each running a half marathon. Alice and Sharon plan to split a marathon. Alice's half-marathon times average 92 minutes with a Standard deviation of 4 minutes, and Sharon's half-marathon times average 96 minutes with a standard deviation of 2 minutes. Assume that the women's half-marathon times are independent. The expected time for Alice and Sharon to complete a full marathon is 92 + 96 = 188 minutes. What is the standard deviation of their total time?

• A) 20 minutes
• B) It cannot be determined.
• C) 6 minutes
• D) 2 minutes
• E) 4.5 minutes

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Definitions:

Adenylyl Cyclase

An enzyme that converts ATP to cyclic AMP, playing a critical role in cell signaling pathways.

Endocrine

Pertains to the system of glands that release hormones directly into the bloodstream to regulate body functions.

Chemical Secreted into Blood

Substances released by cells or glands into the bloodstream to act on distant target organs or tissues.

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Cells that have developed distinct characteristics and functions, adapted to perform a specific role within an organism.