Question

mileage tests were conducted on a randomly selected sample of 100 newly developed automobile tires. The average tread wear was found to be 50,000 miles with a standard deviation of 3,500 miles. What is the best estimate of the average tread life in miles for the population of these tires?

Answer 1

Answer: 50,000 miles.

Step-by-step explanation:

We know that the sample mean $(\overline{x})$ is the best point- estimate of the population mean $(\mu)$.

Given : In sample of 100 newly developed automobile tires, the average tread wear was found to be 50,000 miles and with a standard deviation of 3,500 miles.

i.e. $\overline{x}=\text{50,000 miles}$

s=3,500 miles.

Then, the best estimate of the average tread life$(\mu)$ in miles for the population of these tires is 50,000 miles.