SOLUTION: 1. A multiple choice test has 30 questions, and each has five possible answers, of which one is correct. If a student guesses on every question, find the probability of getting ex

Question 427247: 1. A multiple choice test has 30 questions, and each has five possible answers, of which one is correct. If a student guesses on every question, find the probability of getting exactly 40% correct.
I understand n=30 and p=0.20 but the 40% correct is confusing me. Please help.
2. What is the probability that 4 rolls of a fair die will show exactly three fours?
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
30*.4=12 questions p=.2, q=.8
30C12=86493225 combination of 30 things taken 12 at a time.
86493225*p^12*q^18=.0064
.
Ed

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