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16 Jun 2025, 09:29
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
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An apartment building has apartments numbered 2 through 85, consecutively.
Quantity A
The probability that the apartment number of a randomly selected tenant contains a 4
Quantity B
3/14
Quantity A
The probability that the apartment number of a randomly selected tenant contains a 4
Quantity B
3/14
19 Jun 2025, 12:58
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OE
It may be tempting to jump straight into the probability formula here: Probablity = Number of desired outcomes/number of total outcomes
counting each apartment with a 4 in it (those starting with 4 as well as ending in 4) and the number of total apartments would give , which, when simplified, equals Quantity B.
However, notice that the centered information gives information about apartments, while Quantity A is based on selecting a random tenant. There’s no information on how many tenants are in each apartment. The above math works if each apartment has an equal number of tenants. However, if each apartment with a 4 in the number has three tenants while other apartments only have one, it would be more likely that a randomly selected tenant lives in an apartment with a 4 in the number. Since more than one relationship is possible, the correct answer is (D).
Answer: D
It may be tempting to jump straight into the probability formula here: Probablity = Number of desired outcomes/number of total outcomes
counting each apartment with a 4 in it (those starting with 4 as well as ending in 4) and the number of total apartments would give , which, when simplified, equals Quantity B.
However, notice that the centered information gives information about apartments, while Quantity A is based on selecting a random tenant. There’s no information on how many tenants are in each apartment. The above math works if each apartment has an equal number of tenants. However, if each apartment with a 4 in the number has three tenants while other apartments only have one, it would be more likely that a randomly selected tenant lives in an apartment with a 4 in the number. Since more than one relationship is possible, the correct answer is (D).
Answer: D
