# Tag Info

### A probability problem involving no replacement

Here is an approach using only Mathematica functions for probability theory: ...
• 31k
Accepted

### A probability problem involving no replacement

Instead of constructing a new list, it's faster to just count the elements that satisfy a criterion: ...
• 49.3k

### Issue with variable within Sum[] bounds

There appears to be a closed-form solution for specified values of $n$. I haven't found the general formula for when $n$ is some positive integer. Here are the results for $n=1, 2,\ldots,8$. (Note ...
• 42.4k
1 vote

### Issue with variable within Sum[] bounds

It's not really an answer. I think that does not have finite closed-form expression in terms of very large class of special functions. ...
Accepted

### How can I find Mean[data] Median[data] Quartiles[data] Variance[data] StandardDeviation[data] of a grouped frequency table

There are probably several alternatives depending on exactly what kind of statistics you want, your context, and what data you actually have. If you literally just have that table (i.e. if we ignore ...
• 31.7k
Accepted

### Solution to Stochastic Differential Equation Including Heaviside Step Function

The following works to me. ...
• 27.8k
Let us assume the size $n$ of the wanted orthogonal matrix mat is even, $n=2k$. I will use the following fact: a real orthogonal matrix have a real Jordan normal form which is a direct sum of $k$-...