Marinada '23

[lang=hr] Mrle vozi traktor koji može voziti brzninama : $0,1,2,3,4,5 \, ms^{-1} $. Svakih $5$ sekundi on nasumično promijeni brzinu (i mora promijeniti brzinu). \\ Kolika je očekivana srednja brzina nakon $25$ sekundi? [/lang] [lang=en] Mrle drives a tractor which can move with following velocities: $0,1,2,3,4,5 \, ms^{-1} $. Every $5$ seconds Mrle randomly changes gears (he must change velocity). \\ What's the expected mean velocity after $25$ seconds? [/lang]