Question

select the correct answer.
kendra wants to know the average height of the 30,000 ninth grade students in florida. she randomly selects 1,000 ninth graders in florida, assuring that the group accurately represents all ninth grade students in florida. kendra finds their average height to be 65 inches. what assumption can be made regarding the approximate average height of all ninth grade students in florida?
the approximate average height of ninth grade students in florida is 65 inches.
the approximate average height of ninth grade students in florida is greater than 65 inches.
the approximate average height of ninth grade students in florida is less than 65 inches.
no assumptions can be made regarding the average height of ninth grade students in florida because there is not enough information.
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Explanation:

Since Kendra randomly selected a representative sample (1,000 students out of 30,000) and found the average height of the sample to be 65 inches, in statistics, when a sample is randomly selected and is representative of the population, the sample mean is a good estimator of the population mean.

Answer:

The approximate average height of ninth - grade students in Florida is 65 inches.