The Random Variable X Represents the Number of Credit Cards

question 92

Multiple Choice

The random variable x represents the number of credit cards that adults have along with the corresponding probabilities. Find the mean and standard deviation. $$\begin{array} { c | c } \mathrm { x } & \mathrm { P } ( \mathrm { x } ) \\\hline 0 & 0.07 \\1 & 0.68 \\2 & 0.21 \\3 & 0.03 \\4 & 0.01\end{array}$$

• A)mean: 1.23; standard deviation: 0.66
• B)mean: 1.30; standard deviation: 0.32
• C)mean: 1.30; standard deviation: 0.44
• D)mean: 1.23; standard deviation: 0.44

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Definitions:

Training

involves educating, instructing, or developing oneself or others in skills and knowledge that relate to specific useful competencies to improve performance.

Workforce

The workforce consists of all the people engaged in or available for work, either in a country or in a particular company or industry.

Women in Their 50s and Older

A demographic group facing unique life transitions and challenges, often including menopause and shifts in familial and social roles.

Men in Their Early 20s and 30s

A demographic group often focusing on career development, personal identity exploration, and establishing significant relationships.