更新1:
Correction : Should be corrected to the nearest year, not to 1 d.p.
Normal Distribution
2011-03-29 5:46 am
Lifetime of a TV is normally distributed with mean = 6 years and s.d. = 2 years. If no more than 5% is to be replaced in the warranty period, what should be the maximum number of years for the warranty period? ( Answer correct to 1 d.p.)
回答 (1)
2011-03-29 6:15 am
✔ 最佳答案
Pr(z < Z) = 5% => z = –1.64z = (x – 6) / 2 = –1.64 => x = 2.72Hence the maximum number of years for the warranty period should be 2
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https://hk.answers.yahoo.com/question/index?qid=20110328000051KK01409