- #1

mwendazimu

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

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

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- Thread starter mwendazimu
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- #1

mwendazimu

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

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

- #2

Pere Callahan

- 586

- 1

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

Homework Helper

MHB

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- 250

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

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

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

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- #4

mwendazimu

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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%

I gave the exact solution and was given a big X. Could my professor be wrong?

- #5

I like Serena

Homework Helper

MHB

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I gave the exact solution and was given a big X. Could my professor be wrong?

What I gave is my 2 cents, which I derived using the formulas given on wikipedia.

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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