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Thread: proablity question

  1. #1 proablity question 
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    Jun 2017
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    (a)
    Replacement times for TV sets are normally distributed with a mean of 8.2 years and a standard deviation of 1.1 years based on Consumer Council Report.
    (i) Find the probability that a randomly selected TV will have a replacement time less than 5.0 years.
    (ii) If you want to provide a warranty so that only 2% of the TV sets will be replaced before the warranty expires, what is the time length of the warranty?
    (iii) Suppose you have a 4-years old TV, what is the chance that you will not have to replace your TV within the coming two years?

    my answer (i) 0.018
    (ii)6years
    (iii)0.0228

    are those answers right?


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