The Probability Mass Between Two Standard Deviations Around the Mean

question 58

Multiple Choice

The probability mass between two standard deviations around the mean for a normal distribution is:

• A)66%
• B)90%
• C)75%
• D)95%
• E)50%

---

Definitions:

Negotiations

The process by which two or more parties aim to reach a mutual agreement through dialogue and compromise on a matter of mutual interest.

Treaty of Fort Stanwix

A 1768 agreement between Native American nations and British colonists, establishing boundary lines in what is now the United States.

Iroquois Confederacy

The Iroquois Confederacy, also known as the Haudenosaunee or Six Nations, was a powerful and influential alliance of six Native American tribes primarily located in the northeastern United States and southeastern Canada.

Reservations

In the context of American history, these are tracts of land managed by a Native American tribe under the U.S. Bureau of Indian Affairs, where the federal government recognizes the tribe's sovereignty to a degree.