Prior to medical visits, patients are asked to complete a self-administered medical history form. The time it takes to complete the form is approximately normally distributed, with a mean of 12.4 minutes and a standard deviation of 2.1 minutes. What percent of the patients will complete this form in less than 10 minutes? (A) 34.0 % (B) 12.6 % (C) 87.3 % (D) 25.2 %

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