Train case study regarding ticketing process

1st Round - Phone screening with recruiter. Basic questions - walk me through your resume, why DK, what do you know about DK, why are you leaving current role 2nd Round - 45 minute case study on expected value with analyst that builds on itself. Comparing the price of grocery stores and the expected value of each haul based on if a coupon will work, then knowing the coupon works if you spent money on gas to drive to the other store is it worth it, then if there is a raffle in one of the items how does that change expected value 3rd Round (Camera on) - 30 minute with hiring manager, STAR questions, how do you prioritize, how do you teamwork, do you present to stakeholders, etc followed by a one hour case on a train system, identifying areas of congestion for riders, and providing solutions. You have to draw graphs here and what kind of data you would use to solve/prove the issues. Basic charts are fine. Summarize the problem the solution in a wrap up statement 4th round - (camera on) 45 minute interview with director of analytics, more STAR questions, handle conflict, what you hope your career will look like etc. followed by 1 hour case study with analyst discussing a new feature DK wants to launch and how you would measure its success between the control and test group. Summarize issue and potential solutions. Feedback was I did really well on everything but the very last part of the last case study in terms of correctly comparing the test and control group. They sneak in some expected value questions in there too but the wording is a bit confusing. Saying things like "if x,y,z is being taken into account for the solution, what would the new LTV be?" when they could say what is the expected value of the LTV given x,y,z. It sounds dumb but when you are under pressure to comprehend the problem on camera its a bit intense. You do get prompted and some hints if you're struggling. I did arrive at the correct answer for the last case so was thinking I would get an offer after all of those interviews but they said they went with another candidate. I was told I had strong feedback everywhere expect the last part of the last case so a bit surprised they didn't want to move forward but oh well! Advice - don't spend a month interviewing at a company that pays less than industry standard and has more than 3 rounds of interviews unless it is your absolute dream job.