The central angle of the corresponding sector is 360×10% = 36;
(2).x A = 95× 10+85× 12+75× 10+65×6+55×240 = 80.5，
. x B = 95× 15%+85× 10%+75×45%+65×20%+55× 10% = 75，
∴.x A >。 X B，
The idea of estimating population with samples shows that through the new technological revolution, the output level of A is higher than that of B;
(3)∵ The total number is 40, and the B frequency is 12.
∴ The probability that the yield grade of this peach tree is Grade B (Grade B) = 1240 = 3 10.