Probability Distribution Function (PDF) for a Discrete Random Variable · Exercise 10
Ellen has music practice three days a week. She practices for all of the three days 85 percent of the time, two days 8 percent of the time, one day 4 percent of the time, and no days 3 percent of the time. One week is selected at random.
Define the random variable X.
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Statistics · §4.1 Probability Distribution Function (PDF) for a Discrete Random Variable · Exercise 10
No hints for this one.
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