Answer:
50,000 miles
Step-by-step explanation:
- The best estimation of population mean would be to determine the sample mean. Since the sample size of n = 100 is large enough ( > 30 ).
- The population mean can be reasonably estimated to be equal to sample mean. This condition holds true or reasonably accurate when sample size is large ( > 30 ).
- Otherwise, if n < 30, then we would have to make an unbiased point estimation for the population mean by using the sample mean.
Hence, the answer is 50,000 miles of tread wear.
