Marinada '23

[lang = hr] Igraća kocakica s $20$ strana (označenih brojevima $1$ do $20$) baca se sve dok ne padne broj veći od $10$. Svaki put kada se kocakica baci zapiše se dobiveni broj. Koja je očekivana vrijednost zbroja tih brojeva? [/lang] [lang = en] A player's dice with $20$ sides (marked with the numbers $1$ to $20$) is rolled until a number greater than $10$ is rolled. Each time the die is thrown, the number obtained is written down. What is the expected value of the sum of these numbers? [/lang]