The Number of Emergency Calls Received by a Switchboard in an Hour

question 43

Multiple Choice

The number of emergency calls received by a switchboard in an hour has an expected value of 0.5 and a standard deviation of 0.7.Find the mean and standard deviation of the number of emergency calls received by the switch board during a workshift lasting 4 hours.Assume that the hours are independent of each other.

• A)μ = 2,σ = 11.2
• B)μ = 1.00,σ = 2.8
• C)μ = 2,σ = 2.8
• D)μ = 2,σ = 1.40
• E)μ = 1.00,σ = 1.40

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Definitions:

Nocturnal Emission

A natural phenomenon also known as a wet dream, involving involuntary ejaculation during sleep, often associated with puberty in males.

Wet Dream

An involuntary ejaculation of semen during sleep, often associated with sexual dreams, primarily occurring in adolescent males.

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Female children and adolescents up to the age of 18.

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A rapid increase in physical growth, often experienced during puberty, characterized by accelerated growth in height and other body dimensions.