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Joined: 20 Feb 2017
Posts: 2508
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A set of 25 different integers has a median of 50 and a range of 50. W
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26 Nov 2021, 05:07
26 Nov 2021, 05:07
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A set of 25 different integers has a median of 50 and a range of 50. What is the greatest possible integer that could be in this set?
(A) 62
(B) 68
(C) 75
(D) 88
(E) 100
(A) 62
(B) 68
(C) 75
(D) 88
(E) 100
Re: A set of 25 different integers has a median of 50 and a range of 50. W
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28 Nov 2021, 09:58
28 Nov 2021, 09:58
1
Expert Reply
Consider 25 numbers in ascending order to be \(x_1\), \(x_2\), \(x_3\), ..., \(x_{25}\).
The median of a set with odd number of elements is the middle number (when arranged in ascending or descending order), so the median of given set is \(x_{13}=50\);
The range of a set is the difference between the largest and the smallest numbers of a set, so the range of given set is \(50=x_{25}-x_{1}\) --> \(x_{25}=50+x_{1}\);
We want to maximize \(x_{25}\), hence we need to maximize \(x_{1}\). Since all integers must be distinct then the maximum value of \(x_{1}\) will be \(median-12=50-12=38\) and thus the maximum value of \(x_{25}\) is \(x_{25}=38+50=88\).
The set could be {38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 88}
Answer: D.
The median of a set with odd number of elements is the middle number (when arranged in ascending or descending order), so the median of given set is \(x_{13}=50\);
The range of a set is the difference between the largest and the smallest numbers of a set, so the range of given set is \(50=x_{25}-x_{1}\) --> \(x_{25}=50+x_{1}\);
We want to maximize \(x_{25}\), hence we need to maximize \(x_{1}\). Since all integers must be distinct then the maximum value of \(x_{1}\) will be \(median-12=50-12=38\) and thus the maximum value of \(x_{25}\) is \(x_{25}=38+50=88\).
The set could be {38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 88}
Answer: D.
Re: A set of 25 different integers has a median of 50 and a range of 50. W
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22 Jul 2024, 05:00
22 Jul 2024, 05:00
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