Find the Expected Value and Standard Deviation of a Random

question 9

Multiple Choice

Find the expected value and standard deviation of a random variable.
-A small business just leased a new computer and color laser printer for three years.
The service contract for the computer offers unlimited repairs for a fee of $100 a year
Plus a $25 service charge for each repair needed. The company's research indicates that
During a given year 86% of these computers need no repairs, 9% need to be repaired
Once, 4% twice, 1% three times, and none required more than three repairs. The expected
Number of repairs for this kind of computer per year is

• A) 0.20 repairs.
• B) 0.55 repairs.
• C) 0.89 repairs.
• D) 1.00 repairs.
• E) 1.20 repairs.

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Definitions:

Family Therapy

A type of psychological counseling that helps family members improve communication and resolve conflicts within the family unit.

Multicultural Perspectives

Approaches that recognize, respect, and integrate diverse cultural backgrounds and viewpoints into practices, discussions, and understandings.

Special External Pressures

Unique or extraordinary influences or demands from the environment or society that impact individuals or groups in specific ways.

Group Therapy

A form of psychotherapy that involves one or more therapists working with several individuals at the same time.