Mileage Tests Were Conducted on a Randomly Selected Sample of 100

question 8

Multiple Choice

Mileage tests were conducted on a randomly selected sample of 100 newly developed automobile tires. The average tread life was found to be 80,000 kilometres with a standard deviation of 5,600 kilometres. What is the best estimate of the average tread life in miles for the entire population of these tires?

• A) 80,000
• B) 5,600
• C) (80,000/100)
• D) (5,600/100)

---

Definitions:

South Atlantic

The southern portion of the Atlantic Ocean, extending from the Equator to Antarctica.

Recently Formed

Describing something that has come into existence or been created or established a short while ago.

South Atlantic Ocean

The part of the Atlantic Ocean located south of the Equator, extending between the continents of South America and Africa.

Rifted Apart

A geographical term describing the process by which tectonic plates move away from each other, creating rift valleys or separating landmasses.