Úloha ID 1582 - 
Třídu 2. B navštěvuje osm žáků. Tabulka udává jméno, průměr známek a oblíbený předmět každého žáka. Na základě tabulky rozhodněte, které tvrzení je pravdivé.
| Žák | Průměr | Oblíbený předmět |
| Anička | 1,3 | Matematika |
| Denisa | 1 | Český jazyk |
| Honzík | 1,5 | Výtvarná výchova |
| František | 2,1 | Matematika |
| Tereza | 2,1 | Zeměpis |
| Jitka | 1,4 | Matematika |
| Barbora | 1,1 | Český jazyk |
| Tomáš | 1 | Český jazyk |
Správná odpověď je: A
Ve třídě jsou dvě dívky, které mají jako oblíbený předmět český jazyk (Denisa a Barbora). Protože je ve třídě celkem osm žáků, tak pravděpodobnost, že při náhodném výběru vybereme jednu z těchto dívek, je 0,25 (2/8).
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