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Kindly help on this one. It looks simple until you start solving and you realise that there is no mean or variance!

Also take note that all the information is provided. There is nothing missing in this question,

- Thread starter mwendazimu
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- #1

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Kindly help on this one. It looks simple until you start solving and you realise that there is no mean or variance!

Also take note that all the information is provided. There is nothing missing in this question,

- #2

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What is the density of the log normal distribution and how would you rephrase the given information in terms of this density?

- #3

I like Serena

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proportion bottom 10% = [TEX]1 - \Phi ( \Phi^{-1}(0.9) + \Phi^{-1}(0.37) - \Phi^{-1}(0.1) )[/TEX] = 1.28%

Kindly help on this one. It looks simple until you start solving and you realise that there is no mean or variance!

Also take note that all the information is provided. There is nothing missing in this question,

Last edited:

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I gave the exact solution and was given a big X. Could my professor be wrong?proportion bottom 10% = [TEX]1 - \Phi ( \Phi^{-1}(0.9) + \Phi^{-1}(0.37) - \Phi^{-1}(0.1) )[/TEX] = 1.28%

- #5

I like Serena

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What I gave is my 2 cents, which I derived using the formulas given on wikipedia.I gave the exact solution and was given a big X. Could my professor be wrong?

If you came out to the same answer that should be enough reason to go talk to your professor I guess.

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