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OCR MEI Maths: Paper 2, 12th June 2019 Unofficial mark scheme

Section A:
k=0.1
0.8
24x(x^2 +5)^11
2(x^2 +5)^12 +c

0.71 (trapezium rule)
Underestimate

Mode class: 1
Mid-range : 2.5

Integration by parts: -8x^-4(lnx) -2x^-4 +c

Section B:
Q7: r=5 point something and 7.04

0.28 (tree diagram)
71 weeks or 23 weeks

r = 3
648
sum, 9 days

Inverse function domain: -1<x<3 x<0 where x is real
Range something up to 64

Iteration: 1.3500 with about 12 iterations lol

Removed N/A
Use IQR no outliers
Libya 22900 something

Minimum sample size 40 or 60

Last question: Normal with s.d. 4 mean 35
Use normal distribution to get prob: 0.788707
Then use binomial with probability of over 45 less than 0.05

-Feel free to discuss any answers and i will add any suggestions

(edited 4 years ago)

Scroll to see replies

Reply 1

Andrejcouture27

1.350 or something for the iteration one I think

Reply 2

t_bedford

Minimum sample size? I got 60 but not sure if it's right

Reply 3

Grumpi

I got 40 but that was a straight up guess. How did you do it

Original post by t_bedford

Minimum sample size? I got 60 but not sure if it's right

Reply 4

CL1111

Yeah me too with 40. 100/2.5 because you can't have point something of a jaguar?? really a guess tbh

Original post by Grumpi

I got 40 but that was a straight up guess. How did you do it

Reply 5

t_bedford

Original post by Grumpi

I got 40 but that was a straight up guess. How did you do it

Worked out the minimum n for p(x=0) to be < 0.025 as it said 2 tailed with significance level 0.05. Otherwise it wouldn't be possible for any value to be significant if you see what I mean. Couldn't think of any other way of doing it tbh

Reply 6

AIR127

For Q6, the integration by parts question, f 32/x^5 Lnx dx did anyone else get 32/6 (x^-6) +c

Reply 7

Andrejcouture27

what were your guys' conclusions on the hypothesis tests?

Reply 8

Andrejcouture27

I got -8(x^-4)lnx-2(x^-4)+c

Original post by AIR127

For Q6, the integration by parts question, f 32/x^5 Lnx dx did anyone else get 32/6 (x^-6) +c

Reply 9

MrMoment

Original post by Andrejcouture27

what were your guys' conclusions on the hypothesis tests?

Plane - reject H0
Jaguar - could not reject H0

Reply 10

Crowski144

need the grade boundaries to be as low as the black panther population

Reply 11

Lol45678

What did u get for the number of weeks and probability in the raffle question?

Reply 12

MrMoment

Original post by Lol45678

What did u get for the number of weeks and probability in the raffle question?

71 weeks

Reply 13

diztrezzed

for the gf(x) question did you put f(x) into g(x) or the other way round?

Reply 14

Crowski144

yep

Original post by diztrezzed

for the gf(x) question did you put f(x) into g(x) or the other way round?

Reply 15

lionike123

Normal Distribution was test was significant. We reject the null hypothesis. There is sufficient evidence to suggest that mean time has changed
Binomial Distribution was test was not significant. We do not reject the null hypothesis. There is insufficient evidence to suggest that probability of black panthas has changed.
Both were two tail tests.

(edited 4 years ago)

Reply 16

Lol45678