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En tentand ska stllas infr att flervalsprov med 20 frgor. Situationen r fljande: Med sannolikheten 0.25 blir det 2 svarsmjligheter per frga och med sannolikheten

En tentand ska stllas infr att flervalsprov med 20 frgor. Situationen r fljande: Med sannolikheten 0.25 blir det 2 svarsmjligheter per frga och med sannolikheten 0.75 blir det 4 svarsmjligheter. Det krvs minst 15 rtta svar fr godknt.

Vad r sannolikheten att tentanden blir godknd om hen-oavsett antalet svarsmjligheter-kan svaret p 10 frgor och vljer svar helt slumpmssigt p de vriga 10?

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