Question

Ms. Mills reported her students' scores on the most recent quiz. Score Number of students 82 2 84 5 99 3 X is the score that a randomly chosen student scored. What is the expected value of X? Write your answer as a decimal.

Answer 1

In order to calculate the expected value of x, we can add the score of all students and divide by the number of students. So we have:

$\begin{gathered} E(x)=\frac{82\cdot2+84\cdot5+99\cdot3}{10} \\ E(x)=88.1 \end{gathered}$

So the expected value of x is 88.1.