The scores of individual student on the American College Testing (ACT) Program Compsite College Entrance Eximination have a normal distrubution with a mean of 18.6 students and a standard deviation of 6.0. At Northside High, 36 seniors take the test. Assume the scores at this high school have the same distrubution as the national scores. What is the standard deviation of the sampling distribution of the sample mean score for a random sample of the 36 students?

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