If a Set of Standardized Test Scores Is Normally Distributed,having

question 15

Multiple Choice

If a set of standardized test scores is normally distributed,having a mean of 75 and a standard deviation of 6,approximately 95 percent of the scores are somewhere between

• A) 72 and 78.
• B) 75 and 87.
• C) 69 and 81.
• D) 63 and 87.

---

Definitions:

Horizontal Demand Curve

A demand curve representing a situation where a small change in price leads to an infinite change in quantity demanded, typically associated with perfectly competitive markets.

Four-Firm Concentration Ratio

A measure that indicates the total market share controlled by the four largest firms within an industry.

Herfindahl Index

A measure of market concentration calculated by summing the squares of the market shares of all firms in the industry.

Herfindahl Index

A measure of market concentration to assess the level of competition within an industry, calculated by summing the squares of each company's market share.