A Student Asked a Statistics Professor If Grades Were Marked

question 107

Multiple Choice

A student asked a statistics professor if grades were marked "on the curve." The professor decided to give the student a project to determine if last year's statistics grades were normally distributed. The professor told the student that last year's mean mark was 70 with a standard deviation of 10 and to use the following results. What is the expected number of C's?

• A) 39.25
• B) 34.13
• C) 13.59
• D) 30.00
• E) 15.87

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Definitions:

Stable Inflation

A situation in which the rate of inflation is low and changes very slowly over time.

Marginal Tax Rate

The amount by which taxes increase from an additional dollar of income.

Interest Income

Earnings received from investments in financial assets like savings accounts, certificates of deposit, or bonds, typically expressed as a percentage of the principal.

Aggregate Demand

The aggregate need for every product and service in an economy, measured at a specific overall price level during a certain time frame.