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How do I get the ER to give me a mri? Probability math question! Whole question is in the answer section since it wouldn't fit.? A sample of P-33 has an activity of 0.200 Curies. How long will it take for the activity of the sample to drop to 0.0354 Curies? What is half of 99,375? What if the whole human population screams at once?