Standard deviation of the test scores, Basic Statistics

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Standard deviation of the test scores

Consider a test that measures adults memory skills and suppose that scores are bell shaped. You take the test and obtain a score of 254.21 and are told that you are in 96.1th percentile. Your friend also takes the test and obtains a score of 161.42 and is told that he is in the 22.8th percentile. What is overall mean and standard deviation of the test scores?

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Basic Statistics: Standard deviation of the test scores

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