Official Solution: At a music audition, judges assigned scores to 9 applicants. Among the applicants, 3 tied for the lowest score of 14 points, and 2 tied for the highest score of 65 points. If the median score of the 9 applicants was 50 points, what was the average (arithmetic mean) score of the 9 applicants? Since exactly 3 applicants scored the lowest score of 14, exactly 2 applicants scored the highest score of 65, and the median score was 50, the scores, arranged in ascending order, can be written as:
\(14, 14, 14, a, 50, b, c, 65, 65\)
The question asks for the average score, so we need the value of \(a + b + c\).
(1) If the applicants who received 14 points or 65 points are not considered, the median score of the remaining applicants is 56 points.
After removing the three 14s and the two 65s, the remaining scores are:
\(a, 50, b, c\)
The median of these 4 scores is 56, so:
\(\frac{50 + b}{2} = 56\)
\(50 + b = 112\)
\(b = 62\)
But \(a\) and \(c\) are still not fixed.
Not sufficient.
(2) If the applicants who received 14 points or 65 points are not considered, the range of the remaining scores is 12 points.
After removing the three 14s and the two 65s, the remaining scores are:
\(a, 50, b, c\)
The range is 12, so:
\(c - a = 12\)
But this does not determine \(a + b + c\).
Not sufficient.
(1)+(2) From statement (1):
\(b = 62\)
So the remaining scores are:
\(a, 50, 62, c\)
From statement (2), the range of these numbers, \(c - a\), is 12.
Since the difference between 50 and 62 is already 12, and \(a \leq 50 < 62 \leq c\), we must have:
\(a = 50\) and \(c = 62\)
Thus, the 9 scores are:
\(14, 14, 14, 50, 50, 62, 62, 65, 65\)
The average can be found.
Sufficient.
Answer: C