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Math problem in Grade 2: If the sum of squares of 10 data is 370 and the variance is 33, what is the average value of this set of data? Describe the process briefly.
X2 10 number X 1, ..., X 10, x average = (x1+x2+...+x10)/10.

(X 1)？ +(X2)？ +...+(X 10)？ =370, [(X 1-X average)? +(X2-X average)? +...+(X 10-X average)? ]/ 10=33,

(X 1)？ +(X2)？ +...+(X 10)？ -twice the average (x1+x2+...+x10)+10 (x average)? =330, x average =2

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