Crystal received her SAT score from her counselor. She scored two standard deviations above the mean. What does this indicated about Crystal's score?
To know what this says about her score, we first have to understand a couple of statistical terms. First of all, mean in the average score. Standard deviations are set marks that are based around the mean. 68% of the scores occur within one deviation of the mean, 95% of scores occur within two deviations from the mean, and 99.7% of scores occur within three standard deviations from the mean. Since Crystal's score was two deviations above the mean, we know that she had a higher score than 95% of the people who take the SAT's. This means that her score is in the top 5%.