SOLUTION: 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

Question 366909: 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 100
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
Without the help of further information we assume that scores on aptitude tests are normally distributed. Since the normal distribution is a CONTINUOUS distribution, P(X = 100) = 0. We can only talk about the CUMULATIVE DISTRIBUTION for a continuous distribution. Thus we can only talk about or
, which in either case is equal to 0.50.
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