SOLUTION: the lifetime of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that

Algebra ->  Probability-and-statistics -> SOLUTION: the lifetime of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that      Log On


   

Question 609896: the lifetime of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. What percentage of bulbs has lifetimes that lie within 1 standard deviation of the mean on either side?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi, re TY, see higlighted Percentage (Others were for comparison purposes only)

the lifetime of light bulbs of a particular type are normally distributed with a mean of 370 hours and a standard deviation of 5 hours. 

What percentage of bulbs has life times that lie within 1 standard deviation of the mean on either side? 

****one  standard deviation from the mean accounts for about highlight%2868.2%29% of the set 



two standard deviations from the mean account for about 95.4%

and three standard deviations from the mean account for about 99.7%.