In order to sign a purchase and sale contract with customers, Wang Laohan estimated the total quality of fish in his fish pond and fished out 100 fish for the first time, weighing 184kg.

Therefore, the frequency of marked fish being fished out is 20200=0. 1,

There are 100 marked fish in the pond, so there are about100 ÷ 0.1=1000 fish in the pond.

(2) The average mass of the tagged fish is184 ÷100 =1.84kg,

The mass of 20 marked fish is 1.84× 20 = 36.8kg,

The average mass of fish is184+416100+200 ≈ 2 kg.

That is 1000×2=2000 kg.

A: It is estimated that there are 1000 fish in Wang Laohan's fish pond, with a total weight of 2,000 Jin.