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

---

Definitions:

Raining

The precipitation of water from clouds in the form of water droplets.

Inner Life

Refers to a person's internal emotional, spiritual, or intellectual world and experiences.

Conclusion

The final part of something, such as an argument or piece of writing, summarizing the main points or outcomes.

Proposition

A statement that can either be true or false but not both.