statistical problem

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harry thanopoulos

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Aug 21, 2015
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Hellow, i would like some help..
i am trying to solve a statistical problem, but i find it difficullt enough.. The problem is following:

Thanks a lot in advance!



A fluctuation in the prices of a share has proven to approximate experimentally from the normal distribution, when viewed for a long time. the price of the company has 383 $ mean value and standard deviation of 10$. the investor requests his dealer to sell his shares if the price is between 395 and 399$
what is the probability of selling the shares the next day?
what is the probability of selling the shares within the next 2 days?
 
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harry thanopoulos said:
Hellow, i would like some help..
i am trying to solve a statistical problem, but i find it difficullt enough.. The problem is following:

Thanks a lot in advance!

A fluctuation in the prices of a share has proven to approximate experimentally from the normal distribution, when viewed for a long time. the price of the company has 383 $ mean value and standard deviation of 10$. the investor requests his dealer to sell his shares if the price is between 395 and 399$
what is the probability of selling the shares the next day?
what is the probability of selling the shares within the next 2 days?
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Firstly i thought that the solution was to find this possibility P(395<X<399). So i could use a variable Z=(X-μ)/σ.
μ and σ are known, and so from the table of normal distribution, i could find P((395 - 383)/10<z<(399-383)/10)=P(1.2<z<1.6). the problem is about time.How the possibility changes every day?
 
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