The average value of b is: (83+92+80+95+90+80+85+75) ÷ 8 = 85;
(2) The variance of A is: (100+9+9+16+64+36+1+9) ÷ 8 = 30.5,
The variance of b is: (4+49+25+100+25+0+100) ÷ 8 = 39.375,
The variance of ∫B is greater than the variance of a,
It is appropriate to choose one to attend.