According to my mathematical knowledge, I will give an answer:

(1) This bottle of chocolate beans * * * has 200÷0.5=400 PCs.

(2) According to the sampling survey in mathematics, the number of each chocolate bean can be calculated, and the calculation process is as follows:

Red: 400×4/20=80 (pieces); Orange: 400×3/20=60 (pieces); : yellow 400×3/20=60 (piece);

Green: 400×4/20=80 (pieces); Brown: 400×2/20=40 (piece); Blue: 400×4/20=80 (pieces);