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Four people have an average (arithmetic mean) age of 18, and : Quantitative Comparison Questions

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Re: Four people have an average (arithmetic mean) age of 18, and [#permalink]
D. It cannot be determined from the information given. We can't calculate the range of the four people's ages. Eliminate A. Range can be equal to 25 if one person's age is 1 and second's 26. It can be greater than 25 if the second person's age is 27. Eliminate B and C.
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Re: Four people have an average (arithmetic mean) age of 18, and [#permalink]
the average of ages of four people is 18, meaning the sum of the ages is 72.

Case 1 - max age = 30 min age = 1 => range is 29 which is greater than 25
Case 2 - consider the following ages: 15,15,21,21 => the range is only 6 which is less than 25

Hence there is no clear way we can identify which one is bigger. So answer is D
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Re: Four people have an average (arithmetic mean) age of 18, and [#permalink]
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Re: Four people have an average (arithmetic mean) age of 18, and [#permalink]
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