Talk:Valentine 2018 Event (US)/@comment-116.50.220.48-20180128044906/@comment-171.65.119.241-20180129045146

Disagree with the calculations below. The calculations provided are intended to provide the chance of obtaining at least 1 SSR servant (1-(.99^100th power) is the probability of never getting an SSR in 100 rolls); the problem with this is it doesn't really weight pulling 2, 3, 4, or 5 SSRs any differently than pulling 1 (the person who explains the calc actually explains it correctly, I just don't think that it really answers your question per se). Your question, if I understand correctly, more relates to the average rate of SSR pulls, and whether your number of SSRs is above or below what should be expected.

This is considerably simpler to calculate. Given that the pull rate is 1%, you would expect to obtain, on average, 0.01 SSRs on every pull (or, more practically, 1 SSR per 100 pulls). If you're above this, you're luckier than average. If you're below this, you're not.