Edexcel IGCSE Mathematics June 2016 Official Thread

how many marks was the spheres question?

5 I think. If you messed up the bounds you will probably get error carried forward marks since the mark scheme for this question will probably be split in bands but Edexcel aren't very kind in that sense.

well that sucked

Original post by Pooh monk

63 degrees - 48+15

I think so. Was the theorems used the fact that two radiuses create an isosceles, angle at the center is twice the circumference and the opposite angles in a cyclic quadralateral ?

Reply 283

username1944277

9

how was the maths exam guys, I missed out few questions

Reply 284

Spinal tap

4

Original post by Pooh monk

5 I think. If you messed up the bounds you will probably get error carried forward marks since the mark scheme for this question will probably be split in bands but Edexcel aren't very kind in that sense.

I got upper and lower bands right and converted cm to mm but I forgot to cube it. How many marks off do you think that would be?

Reply 285

_Xenon_

12

Original post by fatimah9

how was the maths exam guys, I missed out few questions

I thought it was OK. :smile:

Hopefully grade boundaries will be lower this year as it was tougher than the January paper half way through the paper.

There is an unofficial mark scheme in progress.

Reply 286

123___A__

4

for the sphere question, all my working was completely correct but I forgot to convert the radius of the sphere from millimetres... how many marks will that cost me?

Reply 287

aaljhfgahsj

2

Original post by DJShaji

I remember it being tan inverse of 8/ root 314 giving answer of 24 or something like that :/

I got that as well

Reply 288

aaljhfgahsj

2

Original post by M12345678

for the sphere question, all my working was completely correct but I forgot to convert the radius of the sphere from millimetres... how many marks will that cost me?

Dude idk I just realized I ****ed up the rounding on the first one so who knows?

Reply 289

memequeen69

6

If for the sphere question, I didn't put anything about bounds, but I calculated the volume and divided it by the number of spheres, i.e I did 91.125/0.036pi, how many marks would I get?

Reply 290

aaljhfgahsj

2

Original post by memequeen69

If for the sphere question, I didn't put anything about bounds, but I calculated the volume and divided it by the number of spheres, i.e I did 91.125/0.036pi, how many marks would I get?

Possibly 2

Reply 291

aaljhfgahsj

2

Original post by Milena1810

I think so. Was the theorems used the fact that two radiuses create an isosceles, angle at the center is twice the circumference and the opposite angles in a cyclic quadralateral ?

Yeah it was exactly that

Reply 292

Milena1810

5

Ooh great another 4 marks bagged ! Thanks

Reply 293

memequeen69

6

I got 2/7 for the probability question; if I forgot the combinations of 2,2,2 how many marks will I get?

Reply 294

lattu27

13

Original post by memequeen69

I got 2/7 for the probability question; if I forgot the combinations of 2,2,2 how many marks will I get?

Maybe 3?

Reply 295

aaljhfgahsj

2

Original post by memequeen69

I got 2/7 for the probability question; if I forgot the combinations of 2,2,2 how many marks will I get?

One or two max I'm afraid, these are the likely mark allocations

M1 for correct calculation of 'one' combination of 1+2+3
M1 for correct calculation of 'one' combination of 2+2+2
M1 for correct number of times each probability is timesed by
M1 for correct addition
A1 for evaluation

Reply 296

_Xenon_

12

Original post by aaljhfgahsj

One or two max I'm afraid, these are the likely mark allocations

M1 for correct calculation of 'one' combination of 1+2+3
M1 for correct calculation of 'one' combination of 2+2+2
M1 for correct number of times each probability is timesed by
M1 for correct addition
A1 for evaluation

Do you know the question number?
Thanks!

Reply 297

aaljhfgahsj

2

Original post by _Xenon_

Do you know the question number?
Thanks!

21 I think?

Reply 298

username1944277

9