Parameters of the lognormal distribution
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The lifetime of an electronic amplifier is modeled as an exponential random variable. If 10% of the amplifiers have a mean of 20,000 hours and the remaining amplifiers have a mean of 50,000 hours, what proportion of the amplifiers fail before 60,0
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The lifetime of a semiconductor laser has a lognormal distribution, and it is known that the mean and standard deviation of lifetime are 10,000 and 20,000, respectively. Calculate the parameters of the lognormal distribution
Let et~WN. Consider two time series models: Model A: (1+1.3B+0.65B*2(raised to the second power) + 0.325B*3 + 1.625B*4 + 0.05B*5)Y t= et Model B: (1+0.8B)Y t= (1-0.5b)et. a) Find the 'greek letter psy' - weights for the two models.
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The lifetime of a mechanical assembly in a vibration test is exponentially distributed with a mean of 400 hours.
Wood Designs Company manufactures unfinished oak furniture. Wood Designs uses a standard cost system. Determine the standard cost per dining room table.
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