The Intelligence Quotient (IQ) Test Scores Are Normally Distributed with a Mean

question 51

Multiple Choice

The Intelligence Quotient (IQ) test scores are normally distributed with a mean of 100 and a standard deviation of 15. i. What is the probability that a person would score between 85 and 115?
ii. Given a class with 25 students, what is the probability that the class' average IQ score is between 85 and 115?

• A) 0.3414, 0.0228
• B) 0.6826, 0.9772
• C) 0.6826, Approximately zero
• D) 1.0, 0.9544

---

Definitions:

Diminishing Marginal Utility

A principle stating that as more of a good or service is consumed, the additional satisfaction from consuming one more unit decreases.

Income Effect

The impact of income changes on the demand for goods or services by an individual or within the economy.

Substitution Effect

Describes how consumers react to a change in the price of a good by substituting it with another good that is relatively cheaper.

Income Effect

The income effect refers to the change in an individual's or economy's income and how that change will impact the quantity demanded of a good or service.