anonymous
  • anonymous
A company installs 5000 light bulbs, each with an average life of 500 hours, standard deviation of 100 hours, and distribution approximated by a normal curve. Find the percentage of bulbs that can be expected to last the period of time. Less than 690 hours A. 97.06% B. 47.14% C. 97.1% D. 97.2%
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
http://www.algebra.com/algebra/homework/Probability-and-statistics/Probability-and-statistics.faq.question.252139.html
amistre64
  • amistre64
|dw:1333483439891:dw|
amistre64
  • amistre64
690-500 is the distance we are from the mean 190 ; we want to measure this against the standard rule of the deviation; so divide this bu the standard deviation 190/100 = 1.9 this value is called a zscore, or a standard score and tells us how many standard deviations we are from the mean

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amistre64
  • amistre64
we look this number up on a ztable; .... plit it into left and right parts tho: 1.90 = 1.9 and .00|dw:1333483648431:dw|
amistre64
  • amistre64
the number located at where they cross is a measurement of an area; but that area is defined by different authors by different ways
amistre64
  • amistre64
|dw:1333483759656:dw| some tables define it as the area from the mean itself; assuming you are aware that the area up to the mean = .5
anonymous
  • anonymous
i figured it iut thanks every one
amistre64
  • amistre64
|dw:1333483834574:dw| others measure the area as if the whole kit and caboodle from the left side

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