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
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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amistre64
  • amistre64
without reading all the little words I believe this is simply an application of the z= stuff
amistre64
  • amistre64
\[z=\frac{x-\bar x}{\sigma}\] \[P(z<690)\frac{690-500}{100}\]
amistre64
  • amistre64
6.9-5 = 1.9 look up in the ztable for the spot 1.9; .00

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amistre64
  • amistre64
if i was smater I would have seen the to use the sd as a ruler would get me 19 times to get from 500 to 690 :)
amistre64
  • amistre64
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