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. With only the information provided, what is the best estimate of the average tread life in miles for the entire population of these tires

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.

0.32

step-by-step explanation:

2.24/7

y=3x+4

step-by-step explanation:

given the points a(0,4) and b(-4, -8)

eqn of line ab: (y-4)/(x-0)=(-8-4)/(-4-0)

(y-4)/x=-12/-4=3

y=3x+4