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Problem-Solving and Data Analysis Difficulty: Easy

On a street with $7$ houses, $2$ houses are blue. If a house from this street is selected at random, what is the probability of selecting a house that is blue?

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Explanation

Choice B is correct. If a house from the street is selected at random, the probability of selecting a house that is blue is equal to the number of houses on the street that are blue divided by the total number of houses on the street. Since there are $2$ blue houses on a street with $7$ total houses, the probability of selecting a house that is blue from this street is $\frac{2}{7}$ .

Choice A is incorrect. This is the probability of selecting a house that is blue from a street on which $1$ of the $7$ houses is blue.

Choice C is incorrect. This is the probability of selecting a house that is not blue from this street.

Choice D is incorrect. This is the probability of selecting a house that is blue from a street on which all the houses are blue.