Use Random-Variable Notation to Represent the Event Use Random-Variable Notation to Represent the Event That the Student

question 120

Multiple Choice

Use random-variable notation to represent the event.
-The following table displays a frequency distribution for the number of siblings for students in one middle school. For a randomly selected student in the school, let X denote the number of siblings of
The student. $\begin{array}{r|rrrrrrrr}\text { Number of siblings } & 0 & 1 & 2 & 3 & 4 & 5 & 6 & 7 \\\hline \text { Frequency } & 189 & 245 & 102 & 42 & 24 & 13 & 5 & 2\end{array}$

Use random-variable notation to represent the event that the student obtained has fewer than two siblings.

• A)\(\{ X \leq 2 \}\)
• B) \(\{ X < 2 \}\)
• C) \(\{ 0,1 \}\)
• D) \(P \{ X < 2 \}\)

---

Definitions:

Macro Skill

A broad, general skill area that encompasses complex capabilities, often used in contrast to more detailed, specific micro skills.

Macro Practice

Social work practice focused on large-scale social processes and institutions, seeking to implement systemic changes or interventions at the community, societal, or policy levels.

Media

Various means of communication, such as television, radio, newspapers, and the internet, used to disseminate information to a large audience.

General Guidelines

Broad and overall recommendations or rules that provide direction for actions or conduct in a variety of situations.