Each day the wildlife commission releases 100 fish into the Durkee River in the following proportions: 55 brown trout and 45 rainbow trout.All of the fish swim through a watch station, one at a time,on the way upstream.which of the following expression represents the way to calculate the probability of a passing fish being a rainbow trout? 1. 45/55 2. 45/ 100 3. 55/100 4. 55-45/100 5. 45 +55 /100