There is insufficient information in the question to answer it. In order to compute a mean and a standard deviation, you need at least two data points, but the question only gave one. Please restate the question.
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Bob scored 300 or 700.
238.6
If you mean 300 plus a 10 percent increase of itself, 330.
300 percent = 3⁄1 or 3.00
300 percent of 3,000 is 9,000.