Blood pressure is distributed Normally, with a mean of 85 mm and a standard deviation of 20 mm. As a research physician you are randomly assigned 100 patients. What is the probability that the average...

Blood pressure is distributed Normally, with a mean of 85 mm and a standard deviation of 20 mm. As a research physician you are randomly assigned 100 patients.

What is the probability that the average blood pressure for your sample of 100 patients is between 81 and 88 mm? (Please round your answer to 3 decimal places: ex, 0.123)