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**Ordinary Level Maths Paper 2...Before/After**
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Here's my answers in full:
(I know I probably made a few sloppy mistakes.)
Could anyone assess my chances at an A1 if I got 290+ marks in the Paper 1?
Section A:
Question 1:
(a): 8 results.
(b): boy-girl ratio and amount already present.
(c):1/8
(d): Niamh; with a 6/8 probability.
Question 2:
(a) Clubs = 13; Pictures = 12; Clubs & Pics = 3; Total = 52.
(b) i. 1/52
ii. 25/52
iii. 0.27
Question 3:
(a) Graph plotted.
(b) Proved methods of same slopes; and same length || sides.
(c) Slope method proof.
Question 4:
(a) x^2 + y^2 = 25
(b) True.
(c) (x+6)^2 + (y-8)^2 = 25
(d) 3x - 4y = -25
Question 5A:
(a) i. Tangent is perpendicular to the center's line to the point of contact.
ii. Tangent constructed with the compass method.
(b) Circumcenter & Circumcircle properly illustrated and labled.
Section B:
Question 6:
(a) i. Barchart
ii. 121,128
iii. 59.7%
iv. Relative arguments given for both Aoife and Paul's arguments.
v. A good bit written for this; hope it's secured.
(b) i. Increased demand @ new years.
ii. Christmas halts buying demand during the October-December months.
iii. Worked out the average % of the total for each year, that was the 1st quarter. Then worked out 100% from that. Got ~77929.
(c) i. Petrol: 26.7%; Diesel: 71%; Other 2.3% {relevant degrees shown in work}
ii. [D]
(d) i. Stem-and-leaf drawn with correct key.
ii. Good information; assuming atleast half marks.
iii. ^ Same as ii.
Question 7: >>> My favourite question on the paper
(a) Wasn't sure about the definition so just said that all angles are less than 90*.
(b) 12.5cm
(c) 8.544cm
(d) 34.176cm
(e) Stays within limit, got 11.4m.
Section C:
Question 8:
(a) i. 2cm
ii. 3.4cm^2
(b) i. Filled in lengths in mm.
ii. 4733.33mm^2
(c) i. 12cm
ii. 108cm^3 (Stupid mistake. -.-)
I really hope I can maintain the A1 grade. Can anyone let me know if I've lost it from sloppy mistakes?0 -
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for simpsons rule i was in a rush and i took h = 5 (people say its meant to be 20 here
)
So i got... A=5/3{F+L+4(evens)+2(odds)} and i did that for the top and bottom half and got rougly 168 cm squared..
Anyone kno how many marks would be lost here?
Also, can anyone tell me how many marks were in the area/volume section? was it 50? im just curious and the papers arent online yet, thanks.0 -
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celtic10000 wrote: »i did 22/52 x 21/51 and got 0.1742
Two cards are drawn from a pack of 52 cards . find the probability that neither
of them is a club or a picture card .
The probability NOT to get a club or picture was 30/52 than for the next one was 29/52 so i just wrote 29.5/52 .... Im not sure if its write.... ( supervisor gave me a spare paper ) 0 -
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Two cards are drawn from a pack of 52 cards . find the probability that neither
of them is a club or a picture card .
The probability NOT to get a club or picture was 30/52 than for the next one was 29/52 so i just wrote 29.5/52 .... Im not sure if its write.... ( supervisor gave me a spare paper )
Actuly thats what i did but its 30/52 x 29/51 (yes its fifty one because you've one less card overall to choose from) so that is = 0.328 ... Did anyone get that?0 -
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