Mean score on a certain aptitude test across the nation is 100
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Assume that the mean score on a certain aptitude test across the nation is 100, and that the standard deviation is 20 points. Find the probability that the mean aptitude test score for a randomly selected group of 150 8th graders is between 97 and 103.
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The mean score on a certain aptitude test across is examined.
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Probability
Assume that the mean score on a certain aptitude test across the nation is 100, and that the standard deviation is 20 points. ...
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