How did Stararmor Thunder tyrant get it?

StarCraft Armor Thunder Tyrant is a new weapon of the new era war version. How can Lei Ba get it? The blueprint of Thunder Tyrant can be obtained after completing a series of missions of New divine retribution and a "unified" bounty mission in the cold weather of Ye Ping and Aobu Valley during the day. The blueprint (all-in-one bounty stage 4) has a drop probability of 5.45%. Expected 7? –? 8 times the basic guarantee 7? –? Eight times, the blueprint (reward stage 5) has a 7.5% chance of falling. Expected 7? –? 8 times the basic guarantee 7? –? Eight times. Expectation is the number of times the player expects to get all the parts at least once based on the corresponding probability of each part. The basic guarantee is based on the probability theory that players can get all the components at once with at least 99%, 99.9% and 99.99% probability.