Talk:Deluxe Festival Bundle/@comment-34188702-20190324235703/@comment-34918040-20190326100618

@ Non-VIP Forever!:

If you look at the Engine cards by type section in the infobox, you'll see that i5 engines are as rare as V8 in this box. They obviously have the same factor p, and both are in (different) groups of 7.


 * "And getting i4s in 3/7 boxes is much higher than the 5.81%."

Of course it is. You could even have had 7 i4 engines in 7 boxes. That's less probable than your 3, but it's possible. Don't forget that it's still a random function that picks the items from the groups. Therefore it is important to have a bigger sample size than 7 boxes (= 28 cards). It's the law of large numbers (cf. Wikipedia article Law of large numbers) which makes the results of a statistical experiment more precise the bigger the sample size is.

In our case, there were 20 i4 engines out of a total of 344 cards. That's the 5.81 %. Your average is. This is more, but it's pure luck. The more boxes you buy, the closer your share of i4 engines will get to 5.81 %.