Question: A local television station sells 15 second, 30 second, and 60 second advertising spots. Let x denote the length of a randomly selected commercial appearing

A local television station sells 15 second, 30 second, and 60 second advertising spots. Let x denote the length of a randomly selected commercial appearing on this station, and suppose that the probability of x is given by the following table:

What is the mean length for commercials appearing on this station?

15 0.1 30 0.3 60 0.6 Px)

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