 Dr. Scale, Supreme Leader Trich, quote, an employee works from Monday to Friday. On Mondays, there's a 30% chance of a mistake being made in a project. 30% chance, damn. On Tuesday, Wednesday and Thursday, there's only a daily 5% chance of a mistake. And on Friday, it's a 15%. That employee should drink less on the weekends. On Friday, it's a 15% chance of a mistake. At the end of the week, there's a single mistake in the project. What is the probability that the mistake was made on a Monday? You just have to do weighted averages. How would this be written into a good and understandable formula? My teacher won't accept it if I solve this with a diagram. It's probability, it's, what do you call it? You average it out, right? So 30% Monday, 30% Monday. Next three days, what was it? 5% each one, the state, oh no. Oh, 5% for the rest. Five, five, five. And 15% on Friday. So Monday, Tuesday, Wednesday, Thursday, Friday. I don't know if I have time to do this. It means it's averages, yeah. So what you end up doing, oh, let me ask, okay. So what you end up doing is, what you could do is just total up the thing. So this is 30, 40, 50, 60. So all of these, you can divide by 60, right? 60. So this is 50% probability here. This is, whatever that is, five divided by 60, five divided by 60, what's the percent there? Five divided by 60 is 0.0. So this is 8.3, repeating percent, 8.3 repeating percent, 8.3 repeating percent. I'm 15 divided by 60, what is that? Quarter 25%, right? 0.2, well, 25%. So the question is, what's the question? What is the probability that the mistake was made on a Monday? 50%, that's all. Any good entry-level books on logic, understanding it for basic everyday use? C.S. Lewis for logic. Read C.S. Lewis to get an appreciation for logic. It's not mathematics related, but it's logic related. Oh wow, you made it look so. I think this is it. MC Mike, is this correct? I'm pretty sure this is correct, if I'm not mistaken. Pretty sure anyway. Yeah, it should be.