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

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Definitions:

Ego Preoccupation

Ego preoccupation is an intense focus or concern with one's own interests, desires, and well-being, sometimes at the expense of others' needs or feelings.

Disengagement Theory

The view that older adults and society withdraw from one another as older adults approach death.

Activity Theory

The view that older adults fare better when they engage in physical and social activities.

Socioemotional Selectivity Theory

The view that we place increasing emphasis on emotional experience as we age but limit our social contacts to regulate our emotions.