My method for ABBA question was 7C4 as you're choosing 4 letters from 7 which = 35. Then you had 3 A's & 2B's I labelled thes A1,2,3, B1,2. You've then got no regard to order in the combinations. So B1&B2 in all options. A1 with A2, A1 with A3 and A2 with A3 giving total of 3 combinations out of the total 35 so 3/35 as my answer. Others seem to agree on 1/70 as final answer so why is my method wrong and how many method marks will I receive?

Reply 224

bazingger

Original post by StruanCaughey

I was unsure but asked my teacher who got 1/70 same as me and so did one of my friends but there also seem to be a lot of other answers out there so I am unsure

Its 1/70 chance that you get The letters ABBA but then you have to worry about the order of those letters. I think...

Reply 225

morrissies

Original post by toosie

Can someone explain to me why there aren't any outliers? What I did was find the iqr (15?) then multiply that by 1.5 then add it to the uq which was 155? So then I got that 177.5-180 were outliers. Is that wrong and why?

I think the box and whisker diagram only went up to 176, so 155+22.5=177.5 (> than the highest value)
Also the LQ - 22.5 was less than 130 (the lowest value.

therefore no outliers

Reply 226

Billy_Boi

Original post by Ozil5

What do people think grade boundaries for this paper will be?

And what do people think this will get, an A or B?

C1: 55
C2; 61
S1: 55 :/

Grade Boundaries usually 175/216 but I think this year 168/216 will be an A. You scored 171/216 so will hopefully scrape an A.

I've got:
C1: 56 (58 best)
C2: 58 (60 best)
S1: 50 (52 best)

I kind of messed this Stats paper up, probably be resitting C1 next year.

Reply 227

bazingger

Original post by Btec certified

I got 1.37

You cant have above 1 for a probability...

Reply 228

mstrcvk

Guys for question 6 I did 0.8^10-0.8^19 instead of 0.8^9-0.8^19, what do you think the mark scheme will be like for this kind of error

Reply 229

Btec certified

It doesn't matter if you write in pencil right?

Reply 230

mstrcvk

And also how many marks will I lose for putting 1-0.8^10 instead of 1-0.8^9, and how many marks is 7bi (it says 8 in unofficial ms)

(edited 7 years ago)

Reply 231

bazingger

Original post by Btec certified

It doesn't matter if you write in pencil right?

YES! They scan the papers, pencil isn't picked up well by scanners...

Reply 232

bazingger

Original post by mstrcvk

And also how many marks will I lose for putting 1-0.8^10 instead of 1-0.8^9, and how many marks is 7bii (it says 8 in unofficial ms)

I did the same, but did it all con my calculator and wrote down the right answer. The mark schemes are very vague s i hop i get it right.

Reply 233

CC21231

I am so stupid I messed up the spear mans rank question so badly. I couldn't work out what to do so I measured where the coordinates were and worked out the difference between them and then used the spearmans rank formula and got 0.952..... ,do you think is will get any marks? I'm so annoyed

(edited 7 years ago)

Reply 234

h3rmit

Original post by Bobby21231

I am so stupid I messed up the spear mans rank question so badly. I couldn't work out what to do so I measured where the coordinates were and worked out the difference between them and then used the spearmans rank formula and got 0.9... ,do you think is will get any marks? I'm so annoyed

I'm pretty sure that's the right answer

Reply 235

InneRs

I lost at least 6 marks now...
Probably resit next year

Reply 236

Balrajan singh

Original post by Bobby21231

I am so stupid I messed up the spear mans rank question so badly. I couldn't work out what to do so I measured where the coordinates were and worked out the difference between them and then used the spearmans rank formula and got 0.9... ,do you think is will get any marks? I'm so annoyed