x B = 94+ 103+ 12+ 1 13+ 1255 = 109.4；

(2) The math scores of 1 student are randomly selected from the math scores of Class A and Class B, and set as X and Y respectively to form a number pair (X, Y).

The numb of all basic events is 5x5 = 25,

The basic events in which the absolute value of the difference between the lottery results is not less than 20 are (9 1,12), (9 1,13), (9 1,/kloc.

( 122,94), ( 123,94), ( 123, 103) * * 8,

∴ Find the probability of p = 825.