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

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) $P \{ X < 2 \}$