Since I got tired of the Gacha (translate: got salty) in Fire Emblem Heroes, I thought I’d spend a bit of my time to investigate the probability and the statistics of my luck on Gacha itself.
There are some summon simulator tool out there that tells us how many orbs we need to summon any 5 star heroes, focus heroes, etc. It even tells us the average orbs needed, median, 90th percentile, etc.