9. (3 points) In a certain entrance examination, 1000 people participated, with an average score of 55 points. 200 people were admitted, and the average score of the admitted candidates differed from that of the non-admitted candidates by 60 points. The admission cut-off score was 4 points less than the average score of the admitted candidates. What is the admission cut-off score? 

 untranslated part:
分.

Note: The last word "分" is a unit of score in Chinese, which can be translated as "points" in English. So the complete translation would be:

9. (3 points) In a certain entrance examination, 1000 people participated, with an average score of 55 points. 200 people were admitted, and the average score of the admitted candidates differed from that of the non-admitted candidates by 60 points. The admission cut-off score was 4 points less than the average score of the admitted candidates. What is the admission cut-off score? 

points.
9. (3 points) In an entrance examination, 1000 people participated, with an average score of 55 points. 200 people were admitted, and the average score of the admitted candidates differed from that of the non-admitted candidates by 60 points. The admission cut-off score is 4 points less than the average score of the admitted candidates. The admission cut-off score is 99 points.
【Solution】Let the average score of the admitted candidates be $X$ points. We can derive the equation,
$$
\begin{aligned}
200 X + (1000 - 200) \times (X - 60) & = 55 \times 1000, \\
200 X + 800 (X - 60) & = 55000, \\
1000 X - 48000 & = 55000, \\
1000 X & = 103000, \\
X & = 103 ;
\end{aligned}
$$

So the admission cut-off score is $103 - 4 = 99$ (points).
Answer: The admission cut-off score is 99 points.
Therefore, the answer is: 99.