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In einer Kiste befinden sich 5 blaue, 10 rote und 5 grüne Kugeln. Aus der Kiste ziehen wir 10 mal zufällig eine Kugel, wobei wir nach jedem Zug die gezogene Kugel wieder zurücklegen. Wir bezeichnen mit X die Anzahl der insgesamt gezogenen blauen Kugeln. Was ist der Erwartungswert von X?5,2,3,2.5
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