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Suppose that throughout the years, the average score of and admissions test of a school is 500 points, with a standard deviation of 50. What
Suppose that throughout the years, the average score of and admissions test of a school is 500 points, with a standard deviation of 50. What is the probability that two groups of 40 and 50 randomly selected students respectively will have a difference in the average score:
A) of 10 points or less
B) that the average score between the groups varies between 5 and 7 points
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