5.1 Expected Value

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1. A tetrahedron has four equal triangular faces. The faces of a tetrahedral die are labelled with the numbers one, three, five, and seven. What is the expected value of the random variable representing the number observed on a single roll of this die?

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The possible values and the expected value must all be whole numbers.

The expected value must be one of the possible values.

The possible values must all be whole numbers but the expected value may be a rational number.

The expected value will not be a whole number.

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