Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta

Edexcel S2 - 27th June 2016 AM watch

  • View Poll Results: How did you find the Edexcel S2 exam?
    Very hard
    145
    14.71%
    Hard
    331
    33.57%
    Normal
    293
    29.72%
    Easy
    152
    15.42%
    Very easy
    65
    6.59%

    Offline

    19
    ReputationRep:
    For E(A) I found what E(R) was, and also found what E(R^2) was but then for the answer I put 49pi... but I also wrote down the correct answer somewhere else on my page... how many marks will I lose ?
    Offline

    1
    ReputationRep:
    (Original post by Student1408)
    Thanks guys, i get it now
    Ouch, I ended up doing E(A) = pi*(E(R))^2
    Offline

    16
    ReputationRep:
    (Original post by mangoli)
    Went alright but was nothing like the past papers. Got stuck on finding k for 20 minutes and decided to move on, how did you guys do it? I got k = 1/(a+21) and couldnt hew another equation in a from it
    F(3)=1
    F(2)=0

    Then simultaneous



    Posted from TSR Mobile
    Offline

    1
    ReputationRep:
    I got k as 1/19 can someone please put up a solution I didn't know how to do it
    Offline

    2
    ReputationRep:
    (Original post by mangoli)
    Went alright but was nothing like the past papers. Got stuck on finding k for 20 minutes and decided to move on, how did you guys do it? I got k = 1/(a+21) and couldnt hew another equation in a from it
    I done it by integrating and making it equal 1, so working out the area under the graph

    then F(3) =1

    then simultaneous
    Offline

    1
    ReputationRep:
    Someone explain why question 5 was 225
    Offline

    1
    ReputationRep:
    How did people get 225? I ended up solving the quadratic p^2 + 0.7p - 55.5 <0 something like that 🙈
    Offline

    18
    ReputationRep:
    I got n = 225 and 342.25 or something and i bsed a bit at the end to say it was 225 due to a positive sqrt being needed. I also wrote 225 is a whole number

    How did you guys show that it was 225 and not 342.25?
    Offline

    9
    ReputationRep:
    Got k wrong (1/4? marks)
    Got n for the 8 marker wrong (6/8? marks)
    Got E(A) wrong (0/4 marks)

    So I am thinking 65/75 or so, not what I wanted, hoping for low grade boundaries.
    Offline

    0
    ReputationRep:
    (Original post by iMacJack)
    F(3)=1
    F(2)=0

    Then simultaneous



    Posted from TSR Mobile
    You don't even need to do simultaneous equations 2a -24 = 0
    Offline

    1
    ReputationRep:
    For q3, wasn't it 49π? E(X)=5+9/2=7E(A)= πr^2= 49π
    Offline

    3
    ReputationRep:
    (Original post by Student403)
    I got n = 225 and 342.25 or something and i bsed a bit at the end to say it was 225 due to a positive sqrt being needed. I also wrote 225 is a whole number

    How did you guys show that it was 225 and not 342.25?
    I just said that it had to be discrete and a whole number and put 225
    Offline

    1
    ReputationRep:
    (Original post by lara24)
    I got k as 1/19 can someone please put up a solution I didn't know how to do it
    I dont remember the numbers but you should have written F(2)=0 and F(3)=1.
    With the first one k cancels so you can find a and sub it into the second to get k=1/9
    Offline

    9
    ReputationRep:
    (Original post by Student403)
    I got n = 225 and 342.25 or something and i bsed a bit at the end to say it was 225 due to a positive sqrt being needed. I also wrote 225 is a whole number

    How did you guys show that it was 225 and not 342.25?
    I put 342.25 as my final answer
    Offline

    1
    ReputationRep:
    I just hope there's a lot of method marks 🙃
    Offline

    6
    ReputationRep:
    looooooooool flopped that that was hard at least i got n=225 ;-;
    Offline

    0
    ReputationRep:
    Can anyone remember the mark structure?
    Offline

    2
    ReputationRep:
    Guys what values did you get for a, b and k?
    Offline

    6
    ReputationRep:
    (Original post by Music With Rocks)
    I put 342.25 as my final answer
    I just put 225 in the whole thing and it worked out to get the probability they showed, my friend put both in when u find the z values, and said you get negative z for 342.25 i think? you didn't really have to say why you picked what?
    Offline

    18
    ReputationRep:
    (Original post by NamelessPersona)
    I just said that it had to be discrete and a whole number and put 225
    Oh okay nice

    (Original post by Music With Rocks)
    I put 342.25 as my final answer
    342.25 would only have worked if you took the negative square root of it in the normal distribution expression which i considered but it seemed too specific
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: August 20, 2016
Poll
Do you agree with the proposed ban on plastic straws and cotton buds?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.