The table below shows the data for a random sample of fish that were collected from and later released into a lake: type of fish
catfish grass carp bluegill number of fish 52 61 87 how many bluegills are estimated to be present if a sample of 800 fish is collected from the lake? 148 174 244 348
You were given the data as statistics so that you can predict the number of a certain type of fish through ratio and proportion. The main focus here is then number of bluegill fish. From the given statistics, the number is 87. The total number of fishes at that time was 52+61+87 = 200. So, assuming that this composition is uniform in the said lake. We can then use the ratio from the given statistics to know the proportion of bluegills to the total fishes. Hence, we equate the two ratios:
87/200 = x/800
where x is the number of bluegills among the 800 total fishes that is in proportion to the gathered statistics. Solving for x, we determine the answer to be
Add the 3 different amount of fish. That is 200, this means that if you multiply that by four your get the amount of all the different fish. (87 x 4 = 348)
