question: an oil refinery
has backup monitory
to keep track of the re
continously and to prevent machine
malfunctions from disrupting the
socess. One particular monety has an
average Life of 4.300 hours and a Standard
deration of 730 hours in addition to
the
primary monitor, the refinery has set up
two Stand by unsti which are duplicates
of the ssimasy ono. In the
case of
malfunction 7 ond f the monitores
f
another will automatically take over inite
place. The operating LIVE f each monitori
ndependent ☆ the votero
(a) What is the probability that a given
Set of monetoso will last at least 18 do hours?
b) atmost 12,630 hours?
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