AQA M1SB 8th of june 2016 unofficial markscheme

Scroll to see replies

Reply 20

Harryg123456

Anyone get 0.355 for the probability of each bottle in the pack?

Reply 21

Dapperblook22

Original post by Harryg123456

Anyone get 0.355 for the probability of each bottle in the pack?

I think I got 0.354, but there is usually a range of answers they accept.

Reply 22

Language student

Original post by Harryg123456

Anyone get 0.355 for the probability of each bottle in the pack?

I think I got that too :smile:

Reply 23

Sirelis

for the reduction of the mean one with the normal distribution and the probability being 0.1 or something I think i got 1522.7 so the mean was reduced by 2.3..? not sure if that's right

Reply 24

xs4

Correction made for now
with regards to the CI questions part bii) you were asked to comment on the claim that 25% or less of the customers bought less than 200 euros
after the conversions of £ to euros and the calculation (no. of customers/n) this claim came to be valid

- I'm unsure of the exact percentage

Reply 25

Hbassett26

Original post by Language student

I think I got that too :smile:

Can you remember how you got that because I think I got it right but I can't remember my answer!

Reply 26

Language student

Original post by Chickenslayer69

Crap... forgot to divide by the square root of n, i'm dumb

how many marks was that Q ive literally never done this question wrong

It was 4 marks

Reply 27

xs4

Original post by Dapperblook22

it wasn't the first 10, as otherwise you would be comparing pounds to euros. You had to either convert the euros to pounds, or the pounds to euros and then find that it was 7/40 entries.

Correct , thanks for pointing that out

Reply 28

Chickenslayer69

Original post by Language student

It was 4 marks

Do you think I might get 1 mark for working? So annoyed. :angry:

Reply 29

Parhomus

Original post by TIF141

Wasn't it 8/40 as one was exactly 166.67 which is 200/1.2? And I think it said 'at most 200', which includes £166.67?

Yes

Reply 30

TIF141

Original post by Sirelis

for the reduction of the mean one with the normal distribution and the probability being 0.1 or something I think i got 1522.7 so the mean was reduced by 2.3..? not sure if that's right

I think I got about 2.3 :biggrin:

Reply 31

Harryg123456

Original post by Sirelis

for the reduction of the mean one with the normal distribution and the probability being 0.1 or something I think i got 1522.7 so the mean was reduced by 2.3..? not sure if that's right

Yep I got that aswell

Reply 32

Language student

Original post by Hbassett26

Can you remember how you got that because I think I got it right but I can't remember my answer!

I used the Normal Stat Mode on the calculator and enter the following: Lower : 505
Upper: 99999999999999
s.d: 3.5
mean: 508.5

Which I get the probability of 0.841, then 0.841^6 which equals to 0.354 to 3sfg

Reply 33

Language student

Original post by Harryg123456

Yep I got that aswell

Me too, I asked my friends and they said they just left it as 1522.7... I was so worried before, now I am confident with my 2.3 hahaha

Reply 34

Parhomus

Original post by Language student

I think I got that too :smile:

Was that the one which u get like 0.8 something ^6

Reply 35

Language student

Original post by Parhomus

W

Was that the one which u get like 0.8 something ^6

Yep

Reply 36

Language student

Original post by Chickenslayer69

Do you think I might get 1 mark for working? So annoyed. :angry:

I think I done that questions wrong as well looking at what people said here, I didn't get any negatives... according to my calculator's history.. oh well..

Reply 37

TobyMel

Original post by Language student

You can just use "10" for an infinite upper limit or "-10" for a lower instead of 9999999999999

Reply 38

Chickenslayer69

Original post by Language student

I think I done that questions wrong as well looking at what people said here, I didn't get any negatives... according to my calculator's history.. oh well..

Yeah, I know that I did it wrong and I know what I did wrong, but I don't know how many marks I'd get for forgetting to divide by square root of n. I'd definitely lose 2 for getting the interval wrong, but I'm not sure about the other 2...