Question: Ellen has music practice three days a week. She practices for all of the three days 85% of the time, two days 8% of the

Ellen has music practice three days a week. She practices for all of the three days 85% of the time, two days 8% of the time, one day 4% of the time, and no days 3% of the time.

One week is selected at random.

We know that for a probability distribution function to be discrete, it must have two characteristics. One is that the sim of the probabilities is one.

What is the other characteristic?

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