Probability of selecting a graduating college who had given, Ask an Expert

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A polltaker asked graduating college seniors how many times they had given blood in the last year. The results of the survey are given below. The random variable x represents the number of times a person gave blood and P(x) represents the probability of selecting a graduating college who had given blood that percent of the time. What is the mean number of times a person gave blood based on this poll?

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