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Suppose that the life of an Evercharged battery is normally distributed with a mean life of 12 hours and a standard deviation of 0.72 hours.  What percent of Evercharged batteries will last:

a)  less than 11.5 hours

b)  more than 13 hours

c) between 11.5 and 13 hours?

 Mar 21, 2019
 #1
avatar+2067 
-2

 

cool

 Mar 21, 2019
edited by Nickolas  Mar 21, 2019
 #2
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Nickolas, please do not answer questions when you have not idea what you are talking about. 

It is definitely not going to be helpful.

Melody  Mar 21, 2019
 #3
avatar+100047 
+1

I think this site will be relevant.

 

http://davidmlane.com/hyperstat/z_table.html

 Mar 21, 2019

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