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Which of the following examples describes a variable that is normally distributed?

asked in Psychology by
a. Grade inflation on college campuses has been a hot topic as there has been an increase in the proportions of students who are awarded higher grades and a corresponding decrease in the proportions of lower grades awarded.

b. A political leader argued against income inequality, stating that the top 1 percent of income earners receive more than 20 percent of all income in the country.

c. Grades on the exam were very low as more than 80 percent of the class received a D or an F.

d. The average woman has a shoe size of 8.5, and the majority of women have shoe sizes falling within +/- 1 shoe size of 8.5

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