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The advertising agency counted the number of billboards in each city in the state. Number of billboards Number of cities 63 6 65 4 73 1 113 2 126 5 148 2 X is the number of billboards that a randomly chosen city has. What is the expected value of X? Write your answer as a decimal.

Respuesta :

In order to calculate the expected value of x, we can divide the total number of billboards by the total number of cities:

[tex]\begin{gathered} E(x)=\frac{63\cdot6+65\cdot4+73\cdot1+113\cdot2+126\cdot5+148\cdot2}{20} \\ E(x)=\frac{1863}{20} \\ E(x)=93.15 \end{gathered}[/tex]

So the expected value of x is 93.15.

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