Posted by Mark on Friday, April 25, 2014 at 4:41pm.
LongLast Inc. produces car batteries. The mean life of these batteries is 60 months. The distribution of the battery life closely follows the normal probability distribution with a standard deviation of 8 months.
As part of its testing program, LongLast tests a sample of 25 batteries.
What is the standard error of the mean?
 Math  Damon, Friday, April 25, 2014 at 4:49pm

Math  Mark, Friday, April 25, 2014 at 5:03pm
That does not help calculate the standard of error.

Math  Damon, Friday, April 25, 2014 at 5:10pm
http://www.miniwebtool.com/standarderrorcalculator/
8/sqrt(25) = 8/5 = 1.6