I'll say it nice and slow to ward off future posts about sample size.....
I'm not calculating a drop rate.
I'm using the stated drop rate by the devs, and calculating the chance of a given result. That's an easy math problem, what's the chance of a flipping a coin and getting X amount of heads, what's the chance of drawing two cards from a deck and they're both aces, etc. You don't need sample sizes because I'm not proposing a new rate.
A coin flip is fifty fifty.... What's the chance of getting a heads after one flip? 50%... that's a fact.
Per the devs, what's the chance of getting a shard from a hardnode? 30%, that's a fact. What's the chance of getting none from 24 attempts? 0.02% and that's a fact.
I'm not saying what the drop rate is..... so stop talking about sample size...