9,961 reputation
22148
bio website gottwurfelt.wordpress.com
location Atlanta, GA
age 31
visits member for 4 years, 5 months
seen 32 mins ago

Data scientist and math blogger.


Dec
19
answered how many ways to choose 3 coins?
Dec
18
answered Four dice, probability that difference of some outcomes is equal to others
Dec
16
answered Expected value of a die when decision to role again depends on previous outcome
Dec
15
comment Taylor approximation for $\ln(1.3)$
Your book probably should say $0.255$.
Dec
15
comment Expected value of this deceptively simple variable
To find $E(Z)$: note that $Z$ is either 1, 0, or -1. With what probability does it take each of those values?
Dec
12
awarded  Mortarboard
Dec
11
reviewed Edit Find the last digit of the exponent $x$.
Dec
11
revised Find the last digit of the exponent $x$.
turnt up on the max, fix latex
Dec
11
reviewed Approve Some users are mind bogglingly skilled at integration. How did they get there?
Dec
11
answered Chance of having score of 63
Dec
10
comment What is the probability that a Poisson random variable is prime?
Asymptotically I'd expect $Q(\lambda, 0)$ to be "the probability that a number near $\lambda$ is prime", i. e. about $1/\log \lambda$.
Dec
10
reviewed Reject I'm having difficulty with this limit. Lim as x approaches 2: [(1/x-2)-(4/x^2-4)]
Dec
10
reviewed Approve Is the Product of Banach Spaces a Banach Space?
Dec
9
answered Why is this true? (sum of 2 uniform distributions)
Dec
9
reviewed Approve Third order piecewise cubic taylor approximation
Dec
9
comment Can you select random entry from unknown number of entries?
If I recall correctly this is called "reservoir sampling", also worth googling.
Dec
8
reviewed Approve If $A$ and $B$ are not countable. Is $A \cup B$ not countable and vice versa
Dec
8
reviewed Approve How many triangles in the picture?
Dec
8
comment Why is $\frac {1\cdot2\cdot3\cdot…\cdot n}{(n+1)(n+2)…(2n)}\le \frac 1 {n+1}$
See my edits to answer that question.
Dec
8
revised Why is $\frac {1\cdot2\cdot3\cdot…\cdot n}{(n+1)(n+2)…(2n)}\le \frac 1 {n+1}$
added 301 characters in body