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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
Jul
21
comment What is a cubical sphere?
So a combinatorial cube is something that has the same inclusions among its faces as the usual $n$-cube?
Jul
21
comment What is a cubical sphere?
How do you define "combinatorial cubes"?
Jul
18
comment Bullseye distribution (Rayleigh distr)
I agree with this guess.
Jul
14
answered The probability that 25 people do not have the same birthday
Jul
7
comment The “beach problem”: does anyone know it? or know how to solve it?
I don't read German. Is this basically just a brute-force search or is there something more going on?
Jul
6
comment How accurately can huge factorials be calculated?
The last term in your sum should be $\log \sqrt{n}$ or ${1 \over 2} \log n$.