(a) Find a bound on the probability that one of these Christmas tree lights will require replacement between 200 hr and 220 hr. at least 100 % (b) Suppose a large city uses 140,000 of these Christmas tree lights as part of its Christmas decorations. Estimate the number of lights that are likely to require replacement between 190 hr an 230 hr of use. lights

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A Christmas
tree light has an expected life of 210 hr and a standard deviation of 2 hr.
(a) Find a bound on the probability that one of these Christmas tree lights will require replacement between 200 hr and 220 hr.
at least 100
%
(b) Suppose a large city uses 140,000 of these Christmas tree lights as part of its Christmas decorations. Estimate the number of lights that are likely to require replacement between 190 hr and
230 hr of use.
lights
Transcribed Image Text:A Christmas tree light has an expected life of 210 hr and a standard deviation of 2 hr. (a) Find a bound on the probability that one of these Christmas tree lights will require replacement between 200 hr and 220 hr. at least 100 % (b) Suppose a large city uses 140,000 of these Christmas tree lights as part of its Christmas decorations. Estimate the number of lights that are likely to require replacement between 190 hr and 230 hr of use. lights
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