Ocr mei unofficial markscheme a level (paper 2 2023)

Collaboration of answers, 2 questions which havent been listed yet may not be in exact order:

Geometric sequence: 6.75

(64/49)^-3/2 = m/n: 343/512

Binomial Dice question: exactly roll twice = 0.00180

Vector question length AB: 2root2

Parametric circle: (x+3)^2+ (y-1)^2 =4

Binomial expansion to find k knowing the coefficient: k = 5

Implicit differentiation lnx: 3x - 4y - 2 = 0

Plants height eval with cf Graph: reading off graph, between 40 and 80

Croydon and camden large data set

Integration by parts: pi/2 -1/2

Data cleaning, finding outliers etc

Drinking and alcohol Probability: 0.07, 0.12, not independent

Composite function and Domain: x^2+3/x^2+2? or x^2-3/x^2-2 Domain -X < -1 or X>1

Apples in a market

Trig equation 2sinx+secx=4cosx?: x = -3/4 pi , -1.249 , 1/4 pi , 1.893

Water consumption

(edited 10 months ago)

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Trig Question Answers Were :
x = -3/4 pi , -1.249 , 1/4 pi , 1.893

Was the answer to m/ n q just 343/512 ?

Original post by billawarra

Was the answer to m/ n q just 343/512 ?

i think so too because you cannot simplify any further from that

K = 5 for the binomial one

3x - 4y - 2 = 0

Distance AB is 2root2, or root8

Integration is pi/2 - 1

(edited 10 months ago)

Domain X < -1 or X>1

(edited 10 months ago)

Probability dice roll 8 exactly twice = 0.00180

Geometric series was 6.75

Hi I got 13.5 for Geometric sequence - is this correct ?

Original post by medical2023

Hi I got 13.5 for Geometric sequence - is this correct ?

I think a=9, and r= -1/3, so it's 6.75.
If u put r= 1/3, then you get 13.5 which is wrong I think

Original post by malymole1

I think a=9, and r= -1/3, so it's 6.75.
If u put r= 1/3, then you get 13.5 which is wrong I think

ahhh ok my bad.. thanks for the clarification

OP

Original post by malymole1

Probability dice roll 8 exactly twice = 0.00180

i dont remember the dice one at all, it wasnt the stats question on the first page was it?

Original post by rrrosiegh

i dont remember the dice one at all, it wasnt the stats question on the first page was it?

8 sided dice. Numbers 1 to 7 had probability p, and 8 had probability 3p. It was in like a table

OP

Original post by malymole1

8 sided dice. Numbers 1 to 7 had probability p, and 8 had probability 3p. It was in like a table

ah yes, i do remember now, thank you

Original post by malymole1

Integration is pi/2 -1/2

i’m pretty sure it’s pi/2 - 1

Original post by malymole1

Domain -1 < x < 1

Pretty sure it's
X < -1 or X>1

Initially h(X): X>3
g(X) = x^2 + 2

x^2 + 2 > 3
x^2 > 1
X < -1 or X>1

Original post by tempfvvvgf

Pretty sure it's
X < -1 or X>1

Initially h(X): X>3
g(X) = x^2 + 2

x^2 + 2 > 3
x^2 > 1
X < -1 or X>1

Oh yeah I got that idk why I wrote down -1<X<1 here I'm so dumb

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