dhruval.shah Posted May 14, 2015 Report Share Posted May 14, 2015 did anyone get the area of the triangle Q on the vector part on P1? I got some complex number involving roots so that doesn't seem right for a P1 ... whoa...did you get something to do with root 66 by any chance? I thought it was the WEIRDEST thing... But I'm pretty sure I got it wrong root 66 was somewhere in my answer .. it was a fraction i think .. that Q was going so well until they asked us to find that area .. I know right? WHOA, so I might get partial marks? That's good enough for me right now, something's better than nothing. Especially because there's quite a high possibility I lost 13 marks in the last 2 letters of #10 That stupid stupid question. I hate Ann, she should lose the game (no offense intended to any Ann's out there) when are we allowed to discuss paper 2 .. it was absolutely terrible Reply Link to post Share on other sites More sharing options...
IbTrojan Posted May 14, 2015 Report Share Posted May 14, 2015 did anyone get the area of the triangle Q on the vector part on P1? I got some complex number involving roots so that doesn't seem right for a P1 ... whoa...did you get something to do with root 66 by any chance? I thought it was the WEIRDEST thing... But I'm pretty sure I got it wrong root 66 was somewhere in my answer .. it was a fraction i think .. that Q was going so well until they asked us to find that area .. I know right? WHOA, so I might get partial marks? That's good enough for me right now, something's better than nothing. Especially because there's quite a high possibility I lost 13 marks in the last 2 letters of #10 That stupid stupid question. I hate Ann, she should lose the game (no offense intended to any Ann's out there) when are we allowed to discuss paper 2 .. it was absolutely terrible Oh no! Really? I made a stupid mistake in Paper 2 which I'm beating myself up over...well I don't know what time it is for you. It's 10 PM for me and we can discuss it at 8:30 AM tomorrow. 24 hours after the exam Reply Link to post Share on other sites More sharing options...
IbTrojan Posted May 14, 2015 Report Share Posted May 14, 2015 I did TZ1. Personally, I feel the grade boundaries this year should be lower. Can't tell if its my personal bias or desperation though lol.I know the feeling mate. I felt like they should be lower too...just in comparison to the past papers. But I can't tell if it's just because of my biased perception of how much harder this exam felt rather than if it actually was. Reply Link to post Share on other sites More sharing options...
dhruval.shah Posted May 14, 2015 Report Share Posted May 14, 2015 I did TZ1. Personally, I feel the grade boundaries this year should be lower. Can't tell if its my personal bias or desperation though lol.I know the feeling mate. I felt like they should be lower too...just in comparison to the past papers. But I can't tell if it's just because of my biased perception of how much harder this exam felt rather than if it actually was. I found P1 to be pretty straightforward, with the exception to the last probability Q involving Ann. P2 wasn't nearly as fun though Reply Link to post Share on other sites More sharing options...
dhruval.shah Posted May 14, 2015 Report Share Posted May 14, 2015 I did TZ1. Personally, I feel the grade boundaries this year should be lower. Can't tell if its my personal bias or desperation though lol.I know the feeling mate. I felt like they should be lower too...just in comparison to the past papers. But I can't tell if it's just because of my biased perception of how much harder this exam felt rather than if it actually was. I found P1 to be pretty straightforward, with the exception to the last probability Q involving Ann. P2 wasn't nearly as fun though How do you guys feel about P1? Reply Link to post Share on other sites More sharing options...
Aga Korycka Posted May 14, 2015 Report Share Posted May 14, 2015 Does anyone remember the answer for #7 TZ2? (the fair game question) I got 25 dollar. What about you?I thought it was pretty hard exam...specially the last question. Whole question 10 was horrible... I got the same answer, hope its correct.. :3Actually it's not . You can never win your money back and the additional profit in a betting game ( which it was) . I opened a betting calculator after the exam , the answer was plain 15 Was it really? That's what I got, but listening to people after the exam all get 25 I figured it was plain wrong. 25 makes perfect sense as I redo the problem. Reply Link to post Share on other sites More sharing options...
dorianb Posted May 14, 2015 Report Share Posted May 14, 2015 Does anyone remember the answer for #7 TZ2? (the fair game question) I got 25 dollar. What about you?I thought it was pretty hard exam...specially the last question. Whole question 10 was horrible... I got the same answer, hope its correct.. :3Actually it's not . You can never win your money back and the additional profit in a betting game ( which it was) . I opened a betting calculator after the exam , the answer was plain 15 Was it really? That's what I got, but listening to people after the exam all get 25 I figured it was plain wrong. 25 makes perfect sense as I redo the problem. 15 is wrong. Think about it. Their logic is that if you play 6/10 games, you will lose 60$, and when you play the remaining 4 games you will gain 60$, which means you win as much as you lose. However, they forget that the fee to play is 10$. So in the end in 10 rounds you will pay 100$, win 60$, hence lose 40$, and showing that when k=15, the game is not fair. Reply Link to post Share on other sites More sharing options...
IBLee Posted May 14, 2015 Report Share Posted May 14, 2015 Does anyone remember the answer for #7 TZ2? (the fair game question) I got 25 dollar. What about you?I thought it was pretty hard exam...specially the last question. Whole question 10 was horrible... I got the same answer, hope its correct.. :3Actually it's not . You can never win your money back and the additional profit in a betting game ( which it was) . I opened a betting calculator after the exam , the answer was plain 15Was it really? That's what I got, but listening to people after the exam all get 25 I figured it was plain wrong. 25 makes perfect sense as I redo the problem. 15 is wrong. Think about it. Their logic is that if you play 6/10 games, you will lose 60$, and when you play the remaining 4 games you will gain 60$, which means you win as much as you lose. However, they forget that the fee to play is 10$. So in the end in 10 rounds you will pay 100$, win 60$, hence lose 40$, and showing that when k=15, the game is not fair.I also got 15 and it still makes more sense to me than anything else. Does anyone remember how many marks the question was worth? Reply Link to post Share on other sites More sharing options...
dorianb Posted May 14, 2015 Report Share Posted May 14, 2015 Does anyone remember the answer for #7 TZ2? (the fair game question) I got 25 dollar. What about you?I thought it was pretty hard exam...specially the last question. Whole question 10 was horrible... I got the same answer, hope its correct.. :3Actually it's not . You can never win your money back and the additional profit in a betting game ( which it was) . I opened a betting calculator after the exam , the answer was plain 15Was it really? That's what I got, but listening to people after the exam all get 25 I figured it was plain wrong. 25 makes perfect sense as I redo the problem.15 is wrong. Think about it. Their logic is that if you play 6/10 games, you will lose 60$, and when you play the remaining 4 games you will gain 60$, which means you win as much as you lose. However, they forget that the fee to play is 10$. So in the end in 10 rounds you will pay 100$, win 60$, hence lose 40$, and showing that when k=15, the game is not fair.I also got 15 and it still makes more sense to me than anything else. Does anyone remember how many marks the question was worth? Could you explain how exactly? Reply Link to post Share on other sites More sharing options...
mhelof Posted May 14, 2015 Report Share Posted May 14, 2015 I did it like E(X) = 10$.And by assuming that I got 25$, but apparently you were supposed to subtract 10$ from it and get 15$. Reply Link to post Share on other sites More sharing options...
dorianb Posted May 14, 2015 Report Share Posted May 14, 2015 (edited) I did it like E(X) = 10$.And by assuming that I got 25$, but apparently you were supposed to subtract 10$ from it and get 15$.But why would you subtract 10? I mean, the goal is to have a fair game, meaning that the net gain is 0. Hence, if you pay 10 and have an expected value of 10, problem solved... Edited May 14, 2015 by dorianb Reply Link to post Share on other sites More sharing options...
mhelof Posted May 14, 2015 Report Share Posted May 14, 2015 I did it like E(X) = 10$.And by assuming that I got 25$, but apparently you were supposed to subtract 10$ from it and get 15$.But why would you subtract 10? I mean, the goal is to have a fair game, meaning that the net gain is 0. Hence, if you pay 10 and have an expected value of 10, problem solved... I don't understand why you'd subtract either, but this is my friend told me. She did it the same way I did but apparently it's wrong. Reply Link to post Share on other sites More sharing options...
dorianb Posted May 14, 2015 Report Share Posted May 14, 2015 I did it like E(X) = 10$.And by assuming that I got 25$, but apparently you were supposed to subtract 10$ from it and get 15$.But why would you subtract 10? I mean, the goal is to have a fair game, meaning that the net gain is 0. Hence, if you pay 10 and have an expected value of 10, problem solved... I don't understand why you'd subtract either, but this is my friend told me. She did it the same way I did but apparently it's wrong.And how do you know it is wrong? Reply Link to post Share on other sites More sharing options...
Aga Korycka Posted May 14, 2015 Report Share Posted May 14, 2015 I did it like E(X) = 10$.And by assuming that I got 25$, but apparently you were supposed to subtract 10$ from it and get 15$.But why would you subtract 10? I mean, the goal is to have a fair game, meaning that the net gain is 0. Hence, if you pay 10 and have an expected value of 10, problem solved... I don't understand why you'd subtract either, but this is my friend told me. She did it the same way I did but apparently it's wrong.And how do you know it is wrong? Okay I got 15, and during the exam my reasoning went like this. White: P(0.6) = she wins nothing (yet I reasoned that she already looses $10 by even playing the game, thus her NET gain/loss is -10, after all in order for it to be a "fair game" it's the net profit that must equal to zero, or so I thought)Black: P(0.4) = she wins K. Thus my E(X) was: 0.6(-10) + 0.4(k) = 0-6 = 0.4k 15 = kAfter the exam though, I listened to someone explain why they got 25 and I suppose that also made sense. Reply Link to post Share on other sites More sharing options...
mhelof Posted May 14, 2015 Report Share Posted May 14, 2015 I wrote "apparently" and I wrote "I don't get it either" :/ my friend told me that this is how you were supposed to do it APPARENTLY meaning I got no idea whyy. Reply Link to post Share on other sites More sharing options...
fie_dahl Posted May 14, 2015 Report Share Posted May 14, 2015 Does anyone remember the answer for #7 TZ2? (the fair game question) I talked to my teacher about it and the $10 should represent 40% so the answer should be $25 1 Reply Link to post Share on other sites More sharing options...
crystalng99 Posted May 14, 2015 Report Share Posted May 14, 2015 8? I thought it was worth 7...the one about Ann, right? I didn't realize it was geometric. I was so stuck on trying to figure out which probability concept to use that I didn't consider it was from another unit I knew it was geometric when it told us to find k and r in (3/8)r^k, which takes on the form of a geometric sequence. I still got it wrong though. What did people put for k and r? I remember k was 9, and r was the probabilities of them both losing multiplied by each other. Reply Link to post Share on other sites More sharing options...
IbTrojan Posted May 14, 2015 Report Share Posted May 14, 2015 8? I thought it was worth 7...the one about Ann, right? I didn't realize it was geometric. I was so stuck on trying to figure out which probability concept to use that I didn't consider it was from another unit I knew it was geometric when it told us to find k and r in (3/8)r^k, which takes on the form of a geometric sequence. I still got it wrong though. What did people put for k and r? I remember k was 9, and r was the probabilities of them both losing multiplied by each other. Oh damn. I thought it was just the probability of HER losing...but I guess I got k right so I'll get something for that? Reply Link to post Share on other sites More sharing options...
dhruval.shah Posted May 14, 2015 Report Share Posted May 14, 2015 So how did you guys find Math P2 TZ1 ? Reply Link to post Share on other sites More sharing options...
IbTrojan Posted May 14, 2015 Report Share Posted May 14, 2015 After discussing Paper 1 so much, and writing Paper 1 and 2 chem, I can't even remember the exam :/ But if you have a specific question, I'll probably remember Reply Link to post Share on other sites More sharing options...
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