A Quiz Consists of 15 Multiple Choice Questions

question 81

Short Answer

A quiz consists of 15 multiple choice questions. Each question has 5 choices, with exactly one correct choice. A student, totally unprepared for the quiz, guesses on each of the 15 questions.
How many questions should the student expect to answer correctly?
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What is the standard deviation of the number of questions answered correctly?
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If at least 9 questions must be answered correctly to pass the quiz, what is the chance the student passes?
______________

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Definitions:

Account

A record or statement of financial expenditure and receipts, related to a specific period or purpose, or a contractual arrangement through which an individual or entity receives financial or banking services.

Cheque

A written, dated, and signed instrument that directs a bank to pay a specific sum of money to the bearer or to a specified person.

Invoice

A document issued by a seller to a buyer, detailing products or services provided, quantities, and agreed prices.

Outstanding Balance

The amount of money owed that has not yet been repaid.