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Probability that mean score on aptitude test is between 98 and 102

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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 98 and 102.

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The expert examines the probability of a mean score on aptitude test between 98 and 102.

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x1 = 98, x2 = 102, mu = 100, sigma = 20, n = 150

z1 = ...

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