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OpenStudy (anonymous):
I have a quiz on something like this tomorrow, please help me understand it!! I'll fan :) A survey asked a sample of people how many times they donate blood each year. The random variable x represents the number of donations in one year. Use the histogram to find the probability that a person selected at random from the survey's sample donated blood (a) more than once in a year and (b) less than three times in a year.
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