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[Official Thread] OCR MEI AS Mathematics 2016 (C1, C2 & S1)

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Can anyone clarify that the median is always n+1/2? I've watched the video posted above on linear interpolation and he took the median value as n/2

Reply 341

ShadowHz

Original post by Crozzer24

Can anyone clarify that the median is always n+1/2? I've watched the video posted above on linear interpolation and he took the median value as n/2

That's how I do mine: not grouped data, median use (n+1)/2. Linear interpolation for grouped data use n/2

Reply 342

JJamieO

Original post by ellabailey2701

For cumulative frequency graphs and histograms do we need to work out upper and lower class boundaries? I've not been taught to do this but its in my revision guide.

For cf graphs I think we just do the upper bound and histograms we do frequency density on the y-axis

Reply 343

ABeingOnEarth

Original post by ShadowHz

Yes, I would say, the chances of coming up is around 60% i think. Check out the reply I did 30 min ago (it's on the same page) It teaches you how to do it.

Why do you think Linear interpolation will come up?

Reply 344

hunter0raf42

Original post by ShadowHz

That's how I do mine: not grouped data, median use (n+1)/2. Linear interpolation for grouped data use n/2

Contonuous data is just n/2 whereas Discrete data is n+1/2

Reply 345

JJamieO

Original post by ellabailey2701

For cumulative frequency graphs and histograms do we need to work out upper and lower class boundaries? I've not been taught to do this but its in my revision guide.

For cf graphs I think we just do the upper bound and histograms we do frequency density on the y-axis

Reply 346

JJamieO

Original post by hunter0raf42

Contonuous data is just n/2 whereas Discrete data is n+1/2

What's discrete and what's continuous data?

Reply 347

neymar69

Discrete data has gaps between them, e.g. shoe sizes e.g. size 10,11. Can't be size 10.34.
Whereas continuous scale has no gaps and its things like distance and measurements which can be 1.69Km or 6.9 inches

Reply 348

♥Samantha♥

Original post by hunter0raf42

Contonuous data is just n/2 whereas Discrete data is n+1/2

This is true but MEI doesn't do this. My teacher rung them up like this is what you're supposed to do, but they were just like no. They said its (n+1)/2 unless you're using a graph.

Reply 349

♥Samantha♥

I'm so tired, for some reason I woke up at 3.

Reply 350

username1530463

Original post by ♥Samantha♥

I'm so tired, for some reason I woke up at 3.

I slept at 6pm and woke up at midnight to do some revision. Are you revising for S1 now?

Reply 351

♥Samantha♥

Original post by asmuse123

I slept at 6pm and woke up at midnight to do some revision. Are you revising for S1 now?

No lol

Reply 352

username1530463

Original post by ♥Samantha♥

No lol

Oh, that's cool. You know, tonight is the night I finally figured out how to do binomial distribution! It's been a good revision session. :biggrin:

Did you find out anything when you were revising?

Reply 353

♥Samantha♥

Original post by asmuse123

Oh, that's cool. You know, tonight is the night I finally figured out how to do binomial distribution! It's been a good revision session. :biggrin:

Did you find out anything when you were revising?

No?

Reply 354

username1530463

Original post by ♥Samantha♥

No?

Well, that's cool. Just making conversation. Good luck in your exam! :biggrin:

Reply 355

ilikecheese666

Original post by ♥Samantha♥

This is true but MEI doesn't do this. My teacher rung them up like this is what you're supposed to do, but they were just like no. They said its (n+1)/2 unless you're using a graph.