A Quiz Consists of 10 Multiple-Choice Questions with 5 Choices

question 103

Multiple Choice

A quiz consists of 10 multiple-choice questions with 5 choices for each question. Suppose a student is sure of the first 5 answers and has each of the last 5 questions narrowed to 3 of the possible 5 choices. If the student guesses among the narrowed choices on the last 5 questions, find the probability of getting at least a C (at least 70%) . Round your answer to four decimal places. ​

• A)Pr(Grade ≥ C) = 0.0412
• B)Pr(Grade ≥ C) = 0.4200
• C)Pr(Grade ≥ C) = 0.5391
• D)Pr(Grade ≥ C) = 0.4609
• E)Pr(Grade ≥ C) = 0.0163