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random variable

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A binomial random variable 2010-11-29
yvette pose la question :
a binomial random variable has a mean equal to 200 and standard deviation of 10. find the values of n and p.
Penny Nom lui répond.
Random 1998-09-15
Hugh Ballantyne pose la question :
I am an occasional teacher.
Here is my question:
Does the word "random" have a technical meaning in mathematics?

Harley Weston lui répond.
The Central Limit Theorem 1997-04-21
Donna Hall pose la question :
A skeptic gives the following argument to show that there must be a flaw in the central limit theorem:
We know that the sum of independent Poisson random variables follows a Poisson distribution with a parameter that is the sum of the parameters of the summands. In particular, if n independent Poisson random variables, each with parameter 1/n, are summed, the sum has a Poisson distribution with parameter 1. The central limit theoren says the sum tends to a normal distribution, but Poisson distribution with parameter 1 is not normal.

What do you think of this argument?
Neal Madras lui répond.

 
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