What does it mean?

Hi there! I wonder what these things means: SST SSM SSE SSR MSR MSE Thanks, Janne = Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at

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SAT scores are approximately normal with mean 500 and a standard devotion 100. Scores of 800 or higher are reported as 800, so a perfect paper is not required to score 800 on the SAT. What percent of students who take the SAT score 800? The answer to this question shall be: SAT scores of 800+