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!! Maths HL Paper 2 2016 - Before and After

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1356

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    #62
    summer98
    Closed Accounts Posts: 18 ✭summer98


    I also got 0.15 phew!

    How about rate part on the high tide question?


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    #63
    DownOneTourist
    Registered Users Posts: 182 ✭✭DownOneTourist


    DublinArnie wrote: »
    The question asked what value of x would make a and b independent events.

    So I just found x.

    Arnie is right there! I double checked that one as I knew it would be an easy place to slip up. They wanted the value X. I'm positive


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    #64
    Appmaths97
    Registered Users Posts: 28 ✭Appmaths97


    DownOneTourist wrote: »
    Arnie is right there! I double checked that one as I knew it would be an easy place to slip up. They wanted the value X. I'm positive
    they wanted both.


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    #65
    DownOneTourist
    Registered Users Posts: 182 ✭✭DownOneTourist


    Appmaths97 wrote: »
    they wanted both.

    don't phunk with my heart! I'll hold you to that! The paper isn't up on examinations.ie yet but im sure it will be shortly. Let's see who's right then. I'm almost certain that the only asked for X and did not ask for the probability of A


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    #66
    Appmaths97
    Registered Users Posts: 28 ✭Appmaths97


    DownOneTourist wrote: »
    don't phunk with my heart! I'll hold you to that! The paper isn't up on examinations.ie yet but im sure it will be shortly. Let's see who's right then. I'm almost certain that the only asked for X and did not ask for the probability of A
    it said write probability of a in terms of x which you probably did


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    #67
    ruairibrady
    Registered Users Posts: 25 ✭ruairibrady


    Can anyways tell me the values they got for the centre of the circle in Q2 part B? I couldn't get it using maths so did a large scaled drawing on the extra pages and ended up with a centre of (6,7) I think? Then subbed it into the formula with a radius of 5 to get S


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    #68
    Appmaths97
    Registered Users Posts: 28 ✭Appmaths97


    ruairibrady wrote: »
    Can anyways tell me the values they got for the centre of the circle in Q2 part B? I couldn't get it using maths so did a large scaled drawing on the extra pages and ended up with a centre of (6,7) I think? Then subbed it into the formula with a radius of 5 to get S

    6,7 was the orthocentre question.


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    #69
    DownOneTourist
    Registered Users Posts: 182 ✭✭DownOneTourist


    Appmaths97 wrote: »
    6,7 was the orthocentre question.

    damn, i got like 8.4,8.6 or something.. ugh. Anyone get root 5 for that cos2theta=1/9 question?


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    #70
    ruairibrady
    Registered Users Posts: 25 ✭ruairibrady


    Appmaths97 wrote:
    6,7 was the orthocentre question.

    Oh they're muddled in my brain, I got a whole number answer through the graph so I was hopeful it was correct


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    #71
    Appmaths97
    Registered Users Posts: 28 ✭Appmaths97


    DownOneTourist wrote: »
    damn, i got like 8.4,8.6 or something.. ugh. Anyone get root 5 for that cos2theta=1/9 question?
    i got root 5 over 3


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    #72
    DublinArnie
    Closed Accounts Posts: 2,823 ✭✭✭DublinArnie


    I spent a good 20 minutes trying to get the equation of the circle for Q2 b.

    My page is destroyed because I kept rubbing my unsatisfactory answer. Hopefully I get attempt marks...


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    #73
    emersyn
    Registered Users Posts: 430 ✭✭emersyn


    Lads what was that


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    #74
    summer98
    Closed Accounts Posts: 18 ✭summer98


    emersyn wrote: »
    Lads what was that

    shiat


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    #75
    daveytheravey
    Registered Users Posts: 45 ✭daveytheravey


    i thought it was a lot more manageable than paper 1. lots of geometry and probability quite prevalent. I think i managed everything okay was annoyed with the construction didnt make much sense.


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    #76
    emersyn
    Registered Users Posts: 430 ✭✭emersyn


    I was a lot happier with paper 1, I'd say I got close to an A in that but probably back down to my usual middling C now :o


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    #77
    DublinArnie
    Closed Accounts Posts: 2,823 ✭✭✭DublinArnie


    emersyn wrote: »
    I was a lot happier with paper 1, I'd say I got close to an A in that but probably back down to my usual middling C now :o

    Was it really that bad? :O :shocked:


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    #78
    Jane98
    Registered Users Posts: 570 ✭✭✭Jane98


    bookworm20 wrote: »
    Does anyone have answers for the lottery question cause im not sure if min were right. i got 1/2600 for the first one.

    probabilities are 1/2600, 9/2600, 9/2600, 81/2600 and 2500/2600.

    then using these you get an expected loss of 29c when charging €2 entry
    part c) then equated to an avg, profit of 71c per game so they needed to charge €3 for this


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    #79
    TSMGUY
    Closed Accounts Posts: 855 ✭✭✭TSMGUY


    Got root 5 over 2 for the cos 2/9 bollocks

    Got 0.25 for A, but you guys say 0.15? Maybe I forgot to subtract 0.1

    Got 8.66, something for the orthocentre, but I knew it was the centroid, not the orthocentre.

    The lottery question was simple as hell. Anyone else get something like 2 euro twenty for the price?
    Jane98 wrote: »
    probabilities are 1/2600, 9/2600, 9/2600, 81/2600 and 2500/2600.

    then using these you get an expected loss of 29c when charging €2 entry
    part c) then equated to an avg, profit of 71c per game so they needed to charge €3 for this
    I thought they were making a profit at the start??? Because you have to times the 2500/2600 by zero as they don't pay anything out if you lose. Am I wrong? Chit....


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    #80
    Gahv
    Registered Users Posts: 20 ✭Gahv


    I hope the marking scheme for the probability question is good feelsbadman.gif


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    #81
    wofias8
    Registered Users Posts: 39 ✭wofias8


    The paper is up on examinations.ie now


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    #82
    emersyn
    Registered Users Posts: 430 ✭✭emersyn


    DublinArnie wrote: »
    Was it really that bad? :O :shocked:

    And I'm usually better at paper 2!! The trig question and the inferential stats question were great, the cos graph was ok (I realise now that I fell victim to misreading minimum or maximum or whatever it was) and nothing else jumps out in my memory as being definitely correct. It's out of the way now anyway, now to cram the whole Biology course in the next 18 hours :D


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    #83
    malnurtured
    Registered Users Posts: 107 ✭✭malnurtured


    TSMGUY wrote: »
    Got root 5 over 2 for the cos 2/9 bollocks

    Got 0.25 for A, but you guys say 0.15? Maybe I forgot to subtract 0.1

    Got 8.66, something for the orthocentre, but I knew it was the centroid, not the orthocentre.

    The lottery question was simple as hell. Anyone else get something like 2 euro twenty for the price?

    The cos2(theta) question? The answer was +/- root 5 over 3.


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    #84
    Appmaths97
    Registered Users Posts: 28 ✭Appmaths97


    would there not be two solutions for the circle s question


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    #85
    malnurtured
    Registered Users Posts: 107 ✭✭malnurtured


    Appmaths97 wrote: »
    would there not be two solutions for the circle s question?

    I heard someone else say that there was two solutions. Didn't get it myself, spent absolutely ages mulling over it to no avail.


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    #86
    DownOneTourist
    Registered Users Posts: 182 ✭✭DownOneTourist


    Q4A part 2 anyone? Did you get y equals root x?


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    #87
    luftmensch
    Closed Accounts Posts: 140 ✭✭luftmensch


    The paper is up now.


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    #88
    InTheNight
    Registered Users Posts: 39 ✭InTheNight


    DownOneTourist wrote: »
    Q4A part 2 anyone? Did you get y equals root x?

    That's what I got!


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    #89
    DublinArnie
    Closed Accounts Posts: 2,823 ✭✭✭DublinArnie


    DownOneTourist wrote: »
    Q4A part 2 anyone? Did you get y equals root x?

    Yeeeer


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    #90
    DownOneTourist
    Registered Users Posts: 182 ✭✭DownOneTourist


    I see where appmaths97 was coming from earlier"Write ܲPA in terms of x and hence, or otherwise, find the
    value of x " You were right! I did right Pa in terms of x then i found x

    angleBCD is 66 degrees for me. Does that ring any bells?


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    #91
    bookworm20
    Registered Users Posts: 38 ✭bookworm20


    q5a ii) anyone rember their answers, it was the one about the arrows and finding the probability that they will win


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