What is overall mean and standard deviation of the test, Ask an Expert

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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 an dis told that he in in the 22.8th percentile. What is overall mean and standard deviation of the test scores? Sketch the distribution and show where you are and where your friend is?

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