LogFAQs > #973504089

It's closer to 80 pulls but yes. Basically, at 74 your chance to get a 5* increases dramatically until 90 pulls where you are guaranteed, but it almost always hits by the low 80s.

Btw this also applies to the limited character banners, and when the banner changes it remembers what pull number you're on (as well as the 50/50), so it's never worth spending your gems on the normal banner.