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Probability calculation

People with type O-negative blood are universal donors. That is, any patient can receive a transfusion of O-negative blood. Only 7% of the American population have O-negative blood. If 10 people appear at random to give blood, what is the probability that at least 1 of them is a universal donor?
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Solution Summary

The solution provides step by step method for the calculation of probability based on Z score. Formula for the calculation and Interpretations of the results are also included.