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

Assess the relationship between various factors (e.g., income, health, love, marriage) and happiness.

Explain the concept of display rules and their relevance to emotional expression.

Understand the concept of subjective and objective components in emotional experiences.

Identify positive coping strategies and their impact on mental health.

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Definitions:

Fossa Ovalis

The fossa ovalis is an anatomical feature of the heart, a depression in the right atrium wall, marking the spot where an opening, the foramen ovale, existed in the fetal heart.

Papillary Muscle

Muscles located in the ventricles of the heart, attaching to the cusps of the atrioventricular valves via chordae tendineae and preventing valve inversion.

Foramen Ovale

An opening in the septum between the right and left atria of the fetal heart, which normally closes shortly after birth.

Ligamentum Arteriosum

The ligamentum arteriosum is a small ligament that is a remnant of the fetal circulation's ductus arteriosus, connecting the aortic arch to the pulmonary artery, closing shortly after birth.