−11,−9,26 A data set of three numbers is shown. If a number from this data set is selected at random, what is the probability of selecting a positive number?
Correct answer: B (parsed from the explanation — this source omits an answer key for this item)
Explanation
Choice B is correct. The probability of selecting a positive number is the number of positive numbers in the data set divided by the total number of numbers in the data set. There is 1 positive number in this data set. There are 3 total numbers in this data set. Thus, if a number from this data set is selected at random, the 1 probability of selecting a positive number is 3. Choice A is incorrect and may result from conceptual or calculation errors. Choice C is incorrect. This is the probability of selecting a negative number from this data set. Choice D is incorrect and may result from conceptual or calculation errors.
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