Question
In: Statistics and Probability
Future Electronics makes compact disc players. Its research department found that the life of the laser...
Future Electronics makes compact disc players. Its research department found that the life of the laser beam device is normally distributed, with mean 4540 hours and standard deviation 410 hours.
(a) Find the probability that the laser beam device will wear
out in 5000 hours or less. (Round your answer to four decimal
places.)
(b) Future Electronics wants to place a guarantee on the players so
that no more than 10% fail during the guarantee period. Because the
laser pickup is the part most likely to wear out first, the
guarantee period will be based on the life of the laser beam
device. How many playing hours should the guarantee cover? (Round
your answer down to the nearest hour.)
hr
Solutions
Expert Solution
Let "X" be the life of the laser beam device in hours
Refer Standard normal table/Z-table to find the probability or use excel formula "=NORM.S.DIST(1.220, TRUE)" to find the probability.
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Refer Standard normal table/Z-table, Lookup for z-score corresponding to area 0.10 to the left of the normal curve OR use excel formula "=NORM.S.INV(0.10)" to find the z-score.
Round the value to the nearest hour.
orchestra answered 2 years agoRelated Solutions
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