Two Students Taking a Multiple Choice Exam with 20 Questions

question 16

Multiple Choice

Two students taking a multiple choice exam with 20 questions and four choices for each question have the same incorrect answer on seven of eight incorrectly answered problems. The probability that student B guesses the same incorrect answer as student A on a particular question is 1/4. If the student is guessing, the guess for one problem is independent of the guess for the other problems. The number of guesses by student B that agree with those of student A has mean and variance given by:

• A)  = 2 and  ² = 1.5.
• B)  = 2 and  ² = 1.5².
• C)  = 4 and  ² = 1.5.
• D)  = 2 and  = 1.5.

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Definitions:

Cash Flows

The movement of money into and out of a business or project, considered crucial for gauging its financial health.

Incremental Changes

Small or minimal adjustments or changes that are made to improve a process, product, or system over time.

Replacement Projects

Projects undertaken by a company to replace old or obsolete assets in order to maintain or improve current operations.

Working Capital

The difference between a company's current assets and current liabilities, indicating its short-term financial health and efficiency.