Checklist VsOSh AI 2026 School Stage (Sirius platform, region group 3), grades 9–11 · Task 6
Outliers Relative to the Mean
Russian title: Задание 6
Count the rows whose third-column value deviates from the column mean by more than the mean itself.
The task
A table has five natural numbers per row; let x be the value in the third column and x̄ its mean over all rows. A row is an outlier if |x − x̄| > x̄.
In how many rows is the third-column value an outlier?
Abridged and translated by SOTA from the official Russian materials. The official statement has the exact rules, and it wins wherever this summary differs.
In English
This task was published in Russian. SOTA translated its 3 files into English on 16 September 2026.
- Task statement Russian original of Task statement
- Official solution Russian original of Official solution
- Full paper with solutions (all tasks of the tour) Russian original of Full paper with solutions (all tasks of the tour)
Read the task statement in English
Outliers Relative to the Mean
English translation by SOTA – AI Community of the Russian original. Organisers who would like this translation removed can email [email protected].
Task 6 of the school stage of the All-Russian School Olympiad (VsOSh) 2025/26 in artificial intelligence (region group III), grades 9–11. The official answer and solution are in a separate file.
The data for this task are in a spreadsheet file. You can download the file in one of three formats: XLSX, ODS, CSV.
A rectangular table is given; each of its rows contains five natural numbers. Denote the value in the third column by . Let us find the mean value of this column:
We will consider a row's value an outlier if the following inequality holds:
Problem. In how many rows is the value in the third column an outlier?
Scoring criterion: exact match of the numerical answer — 12 points
Maximum score for the task — 12
Translated by SOTA. The Russian original is the official version and wins wherever the two differ. Statement and official solution come from one PDF, the analysis of the school-stage tasks for region group III, grades 9–11, linked from the olympiad's Sirius page. The data table (XLSX, ODS or CSV) is a separate file that is not part of the published PDF; the spreadsheet formulas are given with English function names. If you organise this olympiad and would like the translation removed, email [email protected] and we will take it down.
At a glance
- You get
- A table (XLSX, ODS or CSV); not included in the published PDF.
- You submit
- One number.
- Scoring
- Exact answer; 12 points.
- Format
- School stage on the Sirius.Courses platform, region group 3, 20 October 2025; grades 9–11; individual; 150 minutes; maximum 112 points for the paper (tasks 1–6: 12 points each; tasks 7–8: 20 points each).