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:

Coactor Continuation

This term does not refer to a specific, recognized concept within psychological or sociological academic literature; thus, its definition isn't established. If it suggests an idea within a particular context, it would likely pertain to the ongoing participation or involvement of collaborators in a process or activity.

Social Facilitation

The tendency for people to perform differently, typically better, when in the presence of others than when alone.

Social Exhaustion

A state of extreme fatigue and depletion resulting from continuous social interaction or social obligations.

Presence Of A Stranger

A scenario or condition in which an unfamiliar individual is introduced into an environment, often used in psychological research studying social and emotional reactions.