1, sup2 represents a square;
2, such as x? =x+ 1 can be expressed in mathematical language as x 2 = x+ 1.
3, sup2 has two representations in mathematics:
(1) said two s multiplication, read as s square or square;
② Statistically, S 2 is pronounced as variance;
4. sup2 is a tool for measuring the dispersion of sample data. The smaller the variance, the closer these data are to the average.