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Edexcel (IAL) S1 June 15th 2016 Discussion

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i believe that your answer to q3 where they ask you for the p(t=3)=1/2 is incorrect , since the p of 3 alone is 1/2 and you can also obtain a total of three from (1,2) + (2,1) + (0,3)

noo i didnt solve it like that

p(t=3) = (4/16)/1/2= 1/2

Reply 21

MichealD

my answer was 23/36 , what i did is the following
to obtain a total score of 3 or a three you have to add
p(3)+p(0,3)+p(1,2)+p(2,1)

Reply 22

omar5478

Original post by MichealD

i believe that your answer to q3 where they ask you for the p(t=3)=1/2 is incorrect , since the p of 3 alone is 1/2 and you can also obtain a total of three from (1,2) + (2,1) + (0,3)

Ayyyyy, I was really confused by what their answer.

Reply 23

omar5478

Original post by MichealD

my answer was 23/36 , what i did is the following
to obtain a total score of 3 or a three you have to add
p(3)+p(0,3)+p(1,2)+p(2,1)

I did the same

Reply 24

MichealD

did you obtain the same answer ? and what was your answer for the given question?

Reply 25

Sunethra

Original post by MichealD

did you obtain the same answer ? and what was your answer for the given question?

I got the same asnwer too. Which given question?

Reply 26

MichealD

the one under this question where they say what is the p(3 given rolled twice)

Reply 27

wenogk

Original post by MichealD

i believe that your answer to q3 where they ask you for the p(t=3)=1/2 is incorrect , since the p of 3 alone is 1/2 and you can also obtain a total of three from (1,2) + (2,1) + (0,3)

Reply 28

MichealD

Original post by wenogk

thats exactly what i did , what about the question below it , where they asked for the p(3 given rolled twice) i obtained 5/18

Reply 29

wenogk

Original post by MichealD

did you obtain the same answer ? and what was your answer for the given question?

Original post by Sunethra

I got the same asnwer too. Which given question?

Reply 30

Tigernoob

Original post by wenogk

Yes i did it like that except for part 3 i beleive it was my mistake

Reply 31

Tigernoob

There was a question 2 i believe there was a coding where v=(t-5)/10

in the last part he asked for the estimation for mean and standard deviation
i made t the subject correct me if i am wrong

Reply 32

wenogk

Original post by Tigernoob

There was a question 2 i believe there was a coding where v=(t-5)/10

in the last part he asked for the estimation for mean and standard deviation
i made t the subject correct me if i am wrong

For the mean yeah just make t the subject but for standard deviation only multiply by 10

Reply 33

ToxicPhantom007

Original post by Tigernoob

There was a question 2 i believe there was a coding where v=(t-5)/10

in the last part he asked for the estimation for mean and standard deviation
i made t the subject correct me if i am wrong

For mean this is correct but for sd just multiply v by 10 because adding something in coding doesnt affect sd

Reply 34

ToxicPhantom007

Original post by Tigernoob

Yes i did it like that except for part 3 i beleive it was my mistake

Lol my wholw question is wrong
So lost 8 here and 5 in venn diagram
****

Reply 35

Tigernoob

Original post by wenogk

For the mean yeah just make t the subject but for standard deviation only multiply by 10

what i did is i made t the subject so its like 10v+5 is = t

then said E(t)=10XE(v)+5

for standard deviation i did
Var(t)= 10^2 x Var(v)

i converted the s.d i got on the upper part to the variant and mulitplied with the 10^2

i hope what i did correct xD

Reply 36

Tigernoob

Original post by ToxicPhantom007

Lol my wholw question is wrong
So lost 8 here and 5 in venn diagram
****

part 3 wasn't for 8 marks ?

Reply 37

Hamadtype-

What was the skewness?

Reply 38

OnTheHorizon

Ahhh... Finally exams over for me.Paper was easy.I did lose marks in q2.but I'll get atleast 1 mark in that.
And for r and q both were positive right? I don't remember my probability questions :P and you were supposed to the 'show that B=3/8' using simultaneous eq.s