What Is Believed to Be the Composition of Earth's Core $1 / 4$

question 284

Multiple Choice

What is believed to be the composition of Earth's core?

• A) about 80% iron and 20% lighter elements
• B) about \(1 / 4\) iron and
• \(3 / 4\) lighter elements
• C) about half iron and half lighter elements
• D) essentially pure iron

---

Definitions:

Finite Population Correction Factor

A factor applied to the standard error or variance formulas when sampling from a finite population, reducing the sample variance or standard error to account for the finite population size.

Tractor Dealership

A business establishment that sells and sometimes services tractors and related machinery.

Audit

An official inspection of an individual's or organization's accounts, typically by an independent body.

Least Squares

A mathematical procedure for finding the best-fitting curve to a given set of points by minimizing the sum of the squares of the offsets (the vertical distances) from the points to the curve.