Translations of Kolmogorov Student Olympiads in Probability Theory

I have uploaded KCd's translation of the questions for year 5 and my translation of the questions for years 6-8 here.

Please let me know if anything is unclear.

This post is for links to problems in the translation that have been asked on the site:

Problem 10, 7th Kolmogorov Student Olympiad in Probability Theory
(Also previously discussed in this stats.SE question.)