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Maths, Addmaths and Statistics: Post your doubts here!

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Re: O'level Maths, Addmaths and Statistics help available he

Thank you very much. Can you also help me with
N05/P2/Q9. ?
 
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Re: O'level Maths, Addmaths and Statistics help available he

can any one help me in this question???????????
 

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Re: O'level Maths, Addmaths and Statistics help available he

SalmanPakRocks said:
Thank you very much. Can you also help me with
N05/P2/Q9. ?

(i) class bounds c.f
14.5-19.5 5
19.5-24.5 13
24.5-34.5 26
34.5-44.5 46
44.5-54.5 86
54.5-64.5 100

median = 100/2 = 50th term which lies in 44.5-54.5 class (check d c.f table)
median age = l + h/f(N/2 - C)
=44.5 + 10/40(50-46)
=44.5 + 10/40(4)
=44.5 +1 = 45.5yrs

(ii)Q1=100/4=25th term which lies in class 24.5-34.5
Q1 = l + h/f(N/4 - C)
=24.5 = 10/13(25-13)
=33.73yrs approx

Q3 =100 x 3/4 = 75th term which lies in class 44.5-54.5
Q3 = l + h/f(3N/4 - C)
=44.5 +10/40(75-46)
=51.75yrs approx

IQR = 51.75 - 33.73 = 18.02
 
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Re: O'level Maths, Addmaths and Statistics help available he

(iii)a. x(midpoint) d(i.e x-a) fd
17 I -13 I -65
22 I -8 I -64
29.5 I -0.5 I -6.5
39.5 I 9.5 I 190
49.5 I 19.5 I 780
59.5 I 29.5 I 413
total = 1247.5

mean = a + fd/f
=30 + 1247.5/100
=42.5 approx

(b) apply d original formula.all u need 2 do is put 'd' instead ov 'x'.put in al d values n ul get d answer
i hope this helped=)
 
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Re: O'level Maths, Addmaths and Statistics help available he

Jai4ever: check out page 46. dat myt help u a lil=)
 
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Re: O'level Maths, Addmaths and Statistics help available he

salmanpakrocks:plz dnt mind d tables =)
 
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Re: O'level Maths, Addmaths and Statistics help available he

CAN ANYONE SOLVE Q.9 AND Q.10 OF REVIEW QUESTIONS OF CHAPTER 12 OF MATHEMATICS D3 OXFORD
 
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Re: O'level Maths, Addmaths and Statistics help available he

What does this means ? Source N08/P1/Q7
Using a scale of 2 cm to represent 10 kg, starting at −10 kg, on the horizontal axis, and a
scale of 2 cm to represent 2 people per 5 kg on the vertical axis, draw on graph paper a
histogram to illustrate these data.
Should we use Frequency Density in the vertical axis or not ? I m confused here.
 
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Re: O'level Maths, Addmaths and Statistics help available he

I would have solved, but the problem is I gave maths this May/June and after the exam I gave away my books to my junior. So currently I don't have a book. :(
 
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Re: O'level Maths, Addmaths and Statistics help available he

Someone plz tell me the advantages/disadvantages of dual bar charts and percentage bar charts
 
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Re: O'level Maths, Addmaths and Statistics help available he

captainhyderabad said:
Q.10( http://www.youtube.com/watch?v=T9zonvYVa-8)
Q.9(http://www.youtube.com/watch?v=M3WViKMt3K4)
here you go buddy see the questions and then answer me now please
Q10 first part goes like This !!
In the end ov it, 3r = 48, so r = 16 cm
For the second part,
Area of shaded region = Area of triangle OQP - Area of segment formed in smaller circle by QP
So QP = ?
Using cosine rule,
QP^2 = 16^2 + 16^2 - 2(16)(16).cos120
Solving this,
QP = 27.71 cm
Then,
QP=OQ=OP=27.71 cm (Its an equilateral triangle because the angles formed are the same ) !
Area of triangle OQP = 1/2 x 27.71 x 27.1 x sin60 = 332.554 cm^2
Area of segment = area of sector in circle - area of triangle in it
= 120/360 x pie x 16^2 MINUS 1/2 x 16 x 16 x sin120 = 157.23 cm^2
Now, shaded area 332.55 - 157.23 = 175 cm^2 !! :)
 
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Re: O'level Maths, Addmaths and Statistics help available he

captainhyderabad said:
buddy can u please answer Q9 also please
Yeah Sure ! :)
I am gonna be solving the question by referring to This diagram !
The solution to its both parts is Here and Here !!
 
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Re: O'level Maths, Addmaths and Statistics help available he

Thanks Ghalya for doing this, Actually Captainhyderabad I have my papers 10 days from now, so have very little time.
Yes i got A* in maths luckily.
Yes Ghalya is 100% correct.
 
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