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

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#1
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
Last edited by Clark1111; 2 years ago
2
2 years ago
#2
1.350 or something for the iteration one I think
0
2 years ago
#3
Minimum sample size? I got 60 but not sure if it's right
0
2 years ago
#4
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
1
#5
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
0
2 years ago
#6
(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
0
2 years ago
#7
For Q6, the integration by parts question, f 32/x^5 Lnx dx did anyone else get 32/6 (x^-6) +c
3
2 years ago
#8
what were your guys' conclusions on the hypothesis tests?
0
2 years ago
#9
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
6
2 years ago
#10
(Original post by Andrejcouture27)
what were your guys' conclusions on the hypothesis tests?
Plane - reject H0
Jaguar - could not reject H0
4
2 years ago
#11
need the grade boundaries to be as low as the black panther population
19
2 years ago
#12
What did u get for the number of weeks and probability in the raffle question?
0
2 years ago
#13
(Original post by Lol45678)
What did u get for the number of weeks and probability in the raffle question?
71 weeks
5
2 years ago
#14
for the gf(x) question did you put f(x) into g(x) or the other way round?
0
2 years ago
#15
yep
(Original post by diztrezzed)
for the gf(x) question did you put f(x) into g(x) or the other way round?
0
2 years ago
#16
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.
Last edited by lionike123; 2 years ago
1
2 years ago
#17
How did u get that

(Original post by MrMoment)
71 weeks
0
2 years ago
#18
Couldn’t put do half of the paper. Need an A for med school, looking like a U. What a pile of ****.
Last edited by Jamie_1712; 2 years ago
11
2 years ago
#19
15.7 something is nearly 16 so model is a good fit for the plane question for under 2 hours - did anyone else get the same ?
2
2 years ago
#20
70 percent- A star
60 percent- A
50 Percent- B
1
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