The discrete random variable X is the number of students that show up for Professor Smith's office hours on Monday afternoons. The table below shows the probability distribution for X. What is the expected value E(X) for this distribution? $$\begin{array} { l c c c c r }
X & 0 & 1 & 2 & 3 & \text { Total } \
P ( X ) & 40 & 30 & 20 & 10 & 1.00
\end{array}$$
A)1.2
B)1.0
C)1.5
D)2.0

Question

The discrete random variable X is the number of students that show up for Professor Smith's office hours on Monday afternoons. The table below shows the probability distribution for X. What is the expected value E(X) for this distribution? $$\begin{array} { l c c c c r } 
X & 0 & 1 & 2 & 3 & \text { Total } \
P ( X ) & 40 & 30 & 20 & 10 & 1.00
\end{array}$$
A)1.2
B)1.0
C)1.5
D)2.0

Quizplus · Accepted Answer

The Answer of The discrete random variable X is the number of students that show up for Professor Smith's office hours on Monday afternoons. The table below shows the probability distribution for X. What is the expected value E(X) for this distribution? $$\begin{array} { l c c c c r } 
X & 0 & 1 & 2 & 3 & \text { Total } \
P ( X ) & 40 & 30 & 20 & 10 & 1.00
\end{array}$$
A)1.2
B)1.0
C)1.5
D)2.0

The Discrete Random Variable X Is the Number of Students X0123 Total P(X)403020101.00\begin{array} { l c c c c r } X & 0 & 1 & 2 & 3 & \text { Total } \\P ( X ) & 40 & 30 & 20 & 10 & 1.00\end{array}XP(X)​040​130​220​310​ Total 1.00​

The Discrete Random Variable X Is the Number of Students $\begin{array} { l c c c c r } X & 0 & 1 & 2 & 3 & \text { Total } \\P ( X ) & 40 & 30 & 20 & 10 & 1.00\end{array}$