Statisticians needed!

In a 20 pull for Valhalla I got 4 mist and 5 grevle.

I have seen lots of videos of others getting tons of the same thing in a pull. This seems insanely unlikely. Any statisticians out there who could calculate the likelihood of this happening?

To be clear I’m not talking about the odds of getting 3/4* heroes. Or how the odds are unfair. That’s not what this post is about.

Just looking for help from someone better than me at math to try and see how likely/unlikely it is. Because it seems like the chances of this happening would be extremely low.

I don’t know the odds for this, but find it always good to get many 3* dupes. I always need them to max out the special skill of the one that I level.

Normal distribution by Carl Friedrich Gauss


Anything’s possible. I got back-to-back bonus Velas when she was HOTM. The odds of that happening are something like 1.6 in 10,000

To be honest, I’d rather win the lottery.