Given: The type and number of fish caught in the Charleston Harbor in March was recorded for a month
To Determine: The probability that the next fish caught is a Drum or Bluefish
Solution
Calculate the total number of fish caught

It can be observed that we have two types of drum, red drum and black drum. The probability that the next fish caught is a drum or blue fish would be
Probability of red drum or black drum or blue fish
Note that

Therefore, the probability hat the next fish caught is a drum or blue fish would be

So,


Hence, the probability hat the next fish caught is a drum or blue fish is 823/1263 or 0.6516