Angel_Kitty12
  • Angel_Kitty12
Can someone please help me? The Normal Distribution (Algebra 2) LIGHT BULBS: The time that a certain brand of light bulb last before burning out is normally distributed. About 2.5% of the bulbs last longer than 6800 hours and about 16% of the bulbs last longer than 6500 hours. How long does the average bulb last?
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
lol ok thats says that your 2nd standard deviation starts at 6800 and 1st starts at 6500
anonymous
  • anonymous
your mean would be 6200
anonymous
  • anonymous
do you understand why??

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anonymous
  • anonymous
Angel_Kitty12
  • Angel_Kitty12
@Musicdude Really sorry my phone was acting up are you still willing to help me?
anonymous
  • anonymous
yea
Angel_Kitty12
  • Angel_Kitty12
Okay thanks so much and yea I got the mean of 6200 but that can't be the answer is it?
anonymous
  • anonymous
yea it is because the average is the mean
anonymous
  • anonymous
so an average lightbulb would last 6200 hours
anonymous
  • anonymous
cool?
Angel_Kitty12
  • Angel_Kitty12
Wow really..Cause usually it's a whole bunch of other steps...oh wow. God thanks so much :)
anonymous
  • anonymous
no problem

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