The number of seconds XX after the minute that class ends is uniformly distributed between 0 and 60. Round all answers to 4 decimal places where possible. Suppose that 38 classes are clocked.  What is the distribution of ¯xx¯ for this group of classes? ¯xx¯ ~ N(,) What is the probability that the average of 38 classes will end with the second hand between 23 and 28 seconds?

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