Edexcel AS Maths Statistics and Mechanics 22/05/2019 Unofficial MarkScheme

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Poll: What mark do you think you got for this paper? (out of 60)
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helloman1
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#1
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#1
Does anyone have the unofficial mark scheme for the Edexcel AS Maths Statistics and Mechanics Paper 2 22/05/2019?
Thanks
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Yeeted808
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No I just know that I f’d up
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biostudie
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For the Venn Diagrams, I got
X=0
and Y and Z as 0.02 and 0.13 (I forgot which way around, sorry about that )

For distribution I wasn't sure whether to put binomial or uniform.

Stats hypothesis one-tailed test I got X>= 9, and the two mistakes as H1 should be > not >= and that they tried to find P(X=8) not P(X>=8).

Time taken for the pulley I got 1.0 something - possibly 1.02-1.04.

I'm not 100% confident but would like to see what others got!
Cheers
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mani93786
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For mechanics question 2, after Q hits the ground what acceleration does P move at?
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helloman1
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Yes I said the two mistakes were the wrong signs for H1 (should be >).
I also said that she didn't find the critical reigon in order to calculate whether H0 should be discounted.
(Original post by biostudie)
For the Venn Diagrams, I got
X=0
and Y and Z as 0.02 and 0.13 (I forgot which way around, sorry about that )

For distribution I wasn't sure whether to put binomial or uniform.

Stats hypothesis one-tailed test I got X>= 9, and the two mistakes as H1 should be > not >= and that they tried to find P(X=8) not P(X>=8).

Time taken for the pulley I got 1.0 something - possibly 1.02-1.04.

I'm not 100% confident but would like to see what others got!
Cheers
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cmuld
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#6
It doesn't accelerate so you have to work out its final speed after its been accelerated by Q, then use the velocity and remaining distance to calculate that time, adding it to the time whilst its accelerating.
(Original post by mani93786)
For mechanics question 2, after Q hits the ground what acceleration does P move at?
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haxhacks
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For part two of the pulley question,

The answer was 1.04 seconds , acceleration wasnt constant, so you had to take a=4.2 for only 0.4 m (because the particle that causes the acceleration does it because it pulls particle P downwards for 0.4m where the string is now untaut)

Just to confirm, who else got my value?
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arothman101
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Yeah, i got the same. You also had to find the speed of the particle after 0.4m to use that speed as the initial speed for the remaining 1.1
(Original post by haxhacks)
For part two of the pulley question,

The answer was 1.04 seconds , acceleration wasnt constant, so you had to take a=4.2 for only 0.4 m (because the particle that causes the acceleration does it because it pulls particle P downwards for 0.4m where the string is now untaut)

Just to confirm, who else got my value?
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Ryan0887
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#9
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#9
For venn diagram I got y = 0.054 and z= 0.096
(Original post by biostudie)
For the Venn Diagrams, I got
X=0
and Y and Z as 0.02 and 0.13 (I forgot which way around, sorry about that )

For distribution I wasn't sure whether to put binomial or uniform.

Stats hypothesis one-tailed test I got X>= 9, and the two mistakes as H1 should be > not >= and that they tried to find P(X=8) not P(X>=8).

Time taken for the pulley I got 1.0 something - possibly 1.02-1.04.

I'm not 100% confident but would like to see what others got!
Cheers
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Dan7547556
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#10
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#10
****ing ******** paper why was it way harder than the 2018 one
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zambob
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(Original post by arothman101)
Yeah, i got the same. You also had to find the speed of the particle after 0.4m to use that speed as the initial speed for the remaining 1.1
Yhea I like this as well 👌
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zambob
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The one with v=12+4t-t^2 the acceleration was at t=6 and the gradient of the graph is acceleration so differentiate and get - 11 ms^2
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Elliamy
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#13
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I also got -11ms. For the distance S, I integrated the equation for V between limits 3 and 0 and got 45M, what about you?
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Supm8
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#14
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#14
I got 45m !
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ItsEuan
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#15
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the question specified first 2 mistakes which implies there were more
i spotted 3, the 2 u said and that fact that they didnt let X be a RANDOM VARIABLE
it has to be one to be able to binomial distribute something
it came before the the P(X=8) mistake
(Original post by biostudie)
For the Venn Diagrams, I got
X=0
and Y and Z as 0.02 and 0.13 (I forgot which way around, sorry about that )

For distribution I wasn't sure whether to put binomial or uniform.

Stats hypothesis one-tailed test I got X>= 9, and the two mistakes as H1 should be > not >= and that they tried to find P(X=8) not P(X>=8).

Time taken for the pulley I got 1.0 something - possibly 1.02-1.04.

I'm not 100% confident but would like to see what others got!
Cheers
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Supm8
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(Original post by zambob)
The one with v=12+4t-t^2 the acceleration was at t=6 and the gradient of the graph is acceleration so differentiate and get - 11 ms^2
I got -8 ? Coz -2(6)+4 = -8 ? . Is that wrong ?
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haxhacks
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#17
Yes, -8 is the correct answer

But you had to write the magnitude of it, therefore 8 ms^-2
(Original post by Supm8)
I got -8 ? Coz -2(6)+4 = -8 ? . Is that wrong ?
Last edited by haxhacks; 1 year ago
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Supm8
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#18
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#18
How many marks was the tot pulley q?
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haxhacks
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(Original post by Supm8)
How many marks was the tot pulley q?
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haxhacks
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#20
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#20
some kind of stratified sampling
(Original post by Wanderingpro)
did anything come up on chapter 1 of stats like the census stuff
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