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Aug
27
answered How to obtain the Standard Deviation of a ratio of independent binomial random variables?
Aug
25
comment What does E mean in 9.0122222900391E-5?
In case anyone knows: where is this particular number coming from? There are a large number of google hits for it, many of which are not mirrors of this site, whereas (unsurprisingly) if I change the last decimal place by 1 in either direction there are no hits at all.
Aug
25
answered Evaluating a limit involving an integral
Aug
25
awarded  Nice Answer
Aug
23
answered Evaluating the integral $\displaystyle\int_1^2 \int_x^{2x} \sqrt{\dfrac xy} e^{\tfrac yx}\; dy\; dx$
Aug
12
comment How do you find the formula for an area of the circle through integration?
My point is that it would be nice to have some way to calculate π, for example some integral that it's equal to.
Aug
12
comment How do you find the formula for an area of the circle through integration?
Sure, but that just establishes that $\pi$ is half of $2\pi$.
Aug
10
answered If $\chi^2=0$ for a dataset, are the frequencies of the values in the contingency table all the same?
Aug
6
comment $2^x - a$ touches $\log_2(x)$
It is amusing that $a$ is very close to, but not equal to, 2.
Aug
5
comment Cells counting problem
The two-dimensional analogue of this problem, with squares -- how many 1-cells are there in the upper-left N-by-N square in the first slice? -- is apparently a known sequence (oeis.org/A064194)
Aug
3
answered A “fast” way to ,find the maximum value of $(x^2) \times (y^3)$,if $3x+4y=12$ for $x,y \ge 0$
Jul
30
revised Distribution of Max(X_i) | Min(X_i), X_i are iid uniform random variables
had wrong pdf for Y.
Jul
30
comment Distribution of Max(X_i) | Min(X_i), X_i are iid uniform random variables
jrand, you're right. I kept changing my mind on whether I wanted X to be the minimum and Y to be the maximum, or vice versa.
Jul
29
answered Distribution of Max(X_i) | Min(X_i), X_i are iid uniform random variables
Jul
29
comment Boxplots and bar graphs
I agree with Abraham. To clarify, there's 25% in savings and 24% in mortgage expenditures. (A trick for finding them: the two numbers sum to 49, so one of them is at least 49/2 = 24.5, so you really only need to look at the large expenditures.)
Jul
23
answered A nice expression for $P(X>Y, X>Z)$ where $X$ is standard normal, $Y, Z$ are normal with mean 1 and variance 1?
Jul
23
revised A nice expression for $P(X>Y, X>Z)$ where $X$ is standard normal, $Y, Z$ are normal with mean 1 and variance 1?
edited body
Jul
23
comment A nice expression for $P(X>Y, X>Z)$ where $X$ is standard normal, $Y, Z$ are normal with mean 1 and variance 1?
Y and Z have mean 1 and variance 1; that was a typo. I'll fix it.
Jul
22
asked A nice expression for $P(X>Y, X>Z)$ where $X$ is standard normal, $Y, Z$ are normal with mean 1 and variance 1?
Jul
22
awarded  Yearling