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# [Official Thread] OCR MEI AS Mathematics 2016 (C1, C2 & S1) Watch

1. (Original post by Ushma12)
Surely for the last question it gave us the probability that X=2 and that was less than 5%?
It's the probability of X< or =2 which was 0.0530
2. (Original post by Massoom)
Graphical calculator says 4 for IQR so I say 4

I got the IQR wrong and got 3
3. (Original post by erinls2)
I got the IQR wrong and got 3
We're going through the paper with our teacher. 3.6 is the IQR
4. (Original post by ojoo)
For question 5) could you have worked out P(R and S) by doing P(R) X P(S) ?
P(r n s) = p(r) + p(s) - p(r u s)
5. (Original post by Crozzer24)
I got 4 for the iqr but not sure method was right, added the 5th and 6th term then divided by 2 to get 27.8. Added the 15th and the 16th then divided by 2 to get 31.8 so the iqr is 4. Is that right method for working out 5.25th term and 15.75th term? Only question that I'm slightly worried about
This gives you the 5.5th and 15.5th term, which looks to be correct. Think you may have accidentally done it correctly, with correct method too
6. (Original post by Crozzer24)
Think it was only 1 mark
Oh phew- thank you so much for your help!
7. (Original post by ojoo)
For question 5) could you have worked out P(R and S) by doing P(R) X P(S) ?
P(RuS)=P(R)+P(S)-P(RnS)
Use the formula above, which is given in the formula book.
8. (Original post by Massoom)
This gives you the 5.5th and 15.5th term, which looks to be correct. Think you may have accidentally done it correctly, with correct method too
Yeah that's why I'm confused do you work out the 5.5th term or 5.25th because q1 is 21/4 which is 5.25
9. (Original post by ojoo)
For question 5) could you have worked out P(R and S) by doing P(R) X P(S) ?
No u have to use the formula

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10. Anything else you could give us haha?
11. (Original post by lucydkdds)
is it me or was the histogram very difficult to draw because of the scales they gave you? mine was very cramped
Exactly ! I ran out of time because I spent 15 mins drawing and erasing hfff

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12. Pretty sure I got half of the questions wrong I got like 3.6 for IQR oops
13. What did everyone get for the question where it said why can't you carry out the hypothesis test with 20 samples? I something like because there is no value of P(X< which can be lower than the significance level at the lower end of the distribution,

what did everyone get for the question what % of shoes are less than £100
14. i got like 16.1% for the first percentage then like 20 something % for the other
15. (Original post by blipson)
What did everyone get for the question where it said why can't you carry out the hypothesis test with 20 samples? I something like because there is no value of P(X< which can be lower than the significance level at the lower end of the distribution,

what did everyone get for the question what % of shoes are less than £100
I thought it was the percentage which were more than £100, anyways I got 15.7 then 20.2
16. (Original post by gracemay_)
Pretty sure I got half of the questions wrong I got like 3.6 for IQR oops
It's right.
17. (Original post by felixtorrance)
2i) was 0.8^3 so 0.512
Surely the probability that they don't lose in any of the 3 is 1 minus the probability that they lose all three so 1-0.2^3
18. i got 4.3 for IQR?
19. for question 2 iii) did anyone do 1- 0.16 = 0.84
20. (Original post by ilikecheese666)
for question 2 iii) did anyone do 1- 0.16 = 0.84
I got 0.16

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