9. Now suppose the electronic components from Question 48 is assumed to have a lognormal distribution. Again assuming the average lifespan of these components is 250 hours, and that the variance of the under- lying normal distribution is o2 = 2 ... (a) Find the mean of the underlying normal distribution, p. (b) Find the median lifespan of these components. (c) Find the proportion of components with a lifespan less than 200 hours.

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A: Given information Mean = 116 Standard deviation = 14  between 102 and 130

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A: Given values, μ=200σ=24n=9x¯=180

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A: GivenMean(μ)=84standard deviation(σ)=21

Q: A person's blood glucose level and diabetes are closely related. Let x be a random variable measured…

A:

Q: Let x be a random variable that represents red blood cell count (RBC) in millions of cells per cubic…

A: Answer Given The population mean= 4.78This is left-tailed test.

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A: Solution

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A: Use excel formula "=NORM.S.DIST(-1, TRUE)" to find the probability.