.1 Probability Distribution Function (PDF) for a Discrete Rand Variable 1. Example. A student takes a ten-question, true-false quiz. Because the student had such a schedule, he or she could not study and guesses randomly at each answer. What is the probal of the student passing the test with at least a 70 %? 2. Example. Small companies might be interested in the number of long-distance phone calls employees make during the peak time of the day. Suppose the average is 20 calls and a TTres soloctod Whot is the nrobability, that the omplovoos of the moko moro

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