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Prothrombin time (PT) is a blood test that measures the time (in seconds) it takes for blood plasma to clot. In the general population, the

Prothrombin time (PT) is a blood test that measures the time (in seconds) it takes for blood plasma to clot. In the general population, the average PT is 13 seconds, with a standard deviation of 0.3 seconds. The PT for 50 patients was tested. Calculate the standard deviation of the mean, rounded to 2 decimal places. (2 marks)

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