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OpenStudy (anonymous):
Enrique is a volunteer worker at the local blood-donor center. According to the American Red Cross, 42% of blood donors have type O blood. Enrique is also a medical student and is doing a project as part of his studies. He will record the blood type for 150 randomly selected blood donors at the center. What is the probability that the sample proportion of donors with type o blood is between 35% and 50%?
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