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Instructions: Use the empirical rule to find the following probabilities. Remember to draw a normal curve, label the -values for 1, 2, and 3 standard deviations from the mean, and write in the probabilities between each standard deviation before answering the questions. Suppose that the scores on a national achievement exam have a mean of 480 and a standard deviation of 90 What score is 3 standard deviations above the mean? What score is 2 standard deviations below the mean? Approximately 68% will fall between and Approximately 99.7% will fall between and What is the probability that a randomly selected student will score at least a 300? % What is the probability that a student will score at most a 390