Question a-stud
A study was done on the weights of different types of fish in a pond. A random sample of fish were caught and marked in order to ensure that none were weighed more than once. The sample contained 150 largemouth bass, of which 30% weighed more than 2 pounds. Which of the following conclusions is best supported by the sample data?
The majority of all fish in the pond weigh less than 2 pounds.
The average weight of all fish in the pond is approximately 2 pounds.
Approximately 30% of all fish in the pond weigh more than 2 pounds.
Approximately 30% of all largemouth bass in the pond weigh more than 2 pounds.
A study was done on the weights of different types of fish in a pond. A
Medium-difficulty · SAT Math · Inference from Samples & Margin of Error — Population parameter estimation. Read the question above, select your answer, and check the full explanation below to understand exactly why the correct choice works.
Answer explanation
Choice D is correct. The sample of 150 largemouth bass was selected at random from all the largemouth bass in the pond, and since 30% of the fish in the sample weighed more than 2 pounds, it can be concluded that approximately 30% of all largemouth bass in the pond weigh more than 2 pounds.
Choices A, B, and C are incorrect. Since the sample contained 150 largemouth bass, of which 30% weighed more than 2 pounds, this result can be generalized only to largemouth bass in the pond, not to all fish in the pond.
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