Posted by Stacy on .
I am having a small Problem Working this Problem. I am just not understanding. Could someone please assist?
The lifetime of a brand of DVD player follows a normal distribution with
a mean of 8 years and a standard deviation of 6 months. Find the probability
that the lifetime is more than 7 years.
Z = (score-mean)/SD
Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability related to the Z score.