Answer: 50,000 miles.
Step-by-step explanation:
We know that the sample mean [tex](\overline{x})[/tex] is the best point- estimate of the population mean [tex](\mu)[/tex].
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. [tex]\overline{x}=\text{50,000 miles}[/tex]
s=3,500 miles.
Then, the best estimate of the average tread life[tex](\mu)[/tex] in miles for the population of these tires is 50,000 miles.
