# Questions tagged [normal-distribution]

Questions on the Gaussian, or normal probability distribution, which may include multi-dimensional normal distribution.

4,351 questions
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### Poisson distribution to normal distribution?statistics

I need to demonstrate why when (lambda)is big enought poisson distribution becomes (aproximation)to normal distribution. Thanks you
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### Estimating the standard deviation based on sample

I have been given a problem for homework with which I need a little help. In part A, I suspect that the solution has to do something with the degrees of freedom where we use n-1 for sample and n for ...
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### Normal interarrival times

I have the interarrival time $t$ follows a normal distribution of $N(8,4)$. I'm trying to find $P(t < 0)$ The probability that the 16th and the 9th customer arrive within 55 minutes of each other ...
### Determine the distribution of $\Theta$ (Finding the range)
Suppose that $X$ and $Y$ have a two-dimensional normal distribution with means $0$, variances 1, and correlation coefficient $\rho$, $|\rho| < 1$. Let $(R, \Theta)$ be the polar coordinates. ...