Apery’s Constant

The problem So yesterday I came across this video:     In short, Apery’s Constant (C) is this infinity sum: And apparently 1/C is the probability that 3 random integers are co-prime. The Mathematician in video ask his friends on Twitter to write 3 random number in the comments to approximately calculate Apery’s Constant. But […]

Finish 2 courses on Statistical learning

It’s been more than 2 months since I started this blog, but it has been extremely in-active due to my laziness when it comes to writing 🙁 To be honest, I have been actively learning data science, especially statistical learning – the theory for machine learning, but to write something about it requires another level […]

Hello World

Yeah, the day has finally come, I’m writing a blog.   I guess one shouldn’t follow one’s instinct at 1:23 in the morning, after a long working session and still don’t feel sleepy at all. However, writing a blog is something I have wanted to do for such a long time and may be occasions […]


The rule 68% of distribution is within 1 standard deviation from the mean. 95% of distribution is within 2 standard deviation from the mean. 99.7% of distribution is within 3 standard deviation from the mean.   Some other observation In a normal distribution, 1st quartile and 3rd quartile are at 0.68 standard deviation below and […]