4. A company manufactures LED light bulbs. The lifetime for these bulbs is 4,600 hours with a standard deviation of 250 hrs. What lifetime should the company promote for these bulbs, so that only 4.0% of them burnout before the claimed lifetime?

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4. A company manufactures LED light bulbs. The lifetime for these bulbs is 4,600 hours with a
standard deviation of 250 hrs. What lifetime should the company promote for these bulbs, so that
only 4.0% of them burnout before the claimed lifetime?
Transcribed Image Text:4. A company manufactures LED light bulbs. The lifetime for these bulbs is 4,600 hours with a standard deviation of 250 hrs. What lifetime should the company promote for these bulbs, so that only 4.0% of them burnout before the claimed lifetime?
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