Question

The tread life of tires mounted on light-duty trucks follows the normal probability distribution with a population mean of 60,000 miles and a population standard deviation of 14,000 miles. Suppose we select a sample of 140 tires and use a simulator to determine the tread life. What is the standard error of the mean

Answer 1

Answer:

$S.E=1183.2$

Step-by-step explanation:

From the question we are told that:

Population mean $\mu=60000$

Population standard deviation $\sigma= 14,000 miles.$

Sample size $n=140$

Generally the equation for Standard error  is mathematically given by

$S.E=\frac{ \sigma}{ \sqrt n}$

$S.E= \frac{14000}{\sqrt 140}$

$S.E=1183$