Maths, Addmaths and Statistics: Post your doubts here!

[ibadsiddiqi]

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

can someone tell me how to solve q5 of the paper http://www.xtremepapers.me/CIE/Cambridg ... _qp_11.pdf

 

[abcde]

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

Hope this helps.

 

[ibadsiddiqi]

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

ohh. now i get it. Thanx!!

 

[xhizors]

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

pleaseeeeee any one help
4) The temperatures, in °C , at midnight on 10 consecutive days were
4, 1, 0, –2, –1, –3, 1, –2, 3, –1.
(b) How many of these temperatures are within 2.5 °C of 1 °C ?

15) In a sale, a shopkeeper reduced the marked price of his goods by 20%.

(b) The price of a camera in the sale was $60.
Calculate its marked price.

http://www.xtremepapers.me/CIE/Cambridg ... _qp_12.pdf
Q27c
Q11c
whole Q26
Q25b
Q24 b(1,2,3)
Q23d
Q22b
Q21 with explanation of upper bound and lower bound
Q20 whole
Q18b

plz plz help me me from sachai dil sai pray for u Inshallah

 

[Nibz]

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

For Question 27 (c)
=> Let the radius here be x
=> Formula for the arc length here is: 40/360 * 2 * 3 * x ( x radius and 3 your radius)
=> There are three such sectors so multiply this formula by 3 to get the length of all the three arcs!
=> now there are 6 radii (of same length). So add 6x to the formula and equate it to 60 cm!
2x + 6x = 60 (this is the equation in its simplest form)
From here find x.
=> 60/8 => 15/2 is the answer!

For 11(c)
Number of elements in the set (P n Q) U  (P n  R) = 3 (4, 3 & 2)
Total elements are 10!
So probability = 3/10

For question 22 (b)=> 15823.769 = 16000 (correct to 2 significant figure) and 0.0030489 = 0.0030 (to 2 significant figures)
So 16000 x 0.0030 = 50 ( 48 to 1 significant figure = 50)

For Question Question 21! have a look at this: viewtopic.php?f=25&t=8806&p=93390#p93390

You have so many doubts in just one paper!
Just have a look at Mark Scheme here and try them: http://www.xtremepapers.me/CIE/Cambridg ... _ms_12.pdf
If still you have doubts in them, let us know!

 

[killer22]

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

How are u guys preparing for statistics? I mean which book or resource are u guys using???

 

[Maleeha]

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

could anyone send me some link for good questions from number patterns and sequence? i have lost my precious worksheet for this topic...

 

[abcde]

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

could anyone send me some link for good questions from number patterns and sequence? i have lost my precious worksheet for this topic...

AoA!
I don't have questions right now but if you want the techniques, maybe this thread could help you: viewtopic.php?f=25&t=4147
Practice past paper questions on this topic. That ought to be enough!

 

[Maleeha]

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

hmm.. ive already seen that thread.. thnx anyways... actually i already noe the answers of questns frm pastpprx so i noe the answer b4 even startng the questn agn so thought if anyone cud jxt give me some other questnx... kher h..

 

[xhizors]

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

For Question 27 (c)
=> Let the radius here be x
=> Formula for the arc length here is: 40/360 * 2 * 3 * x ( x radius and 3 your radius)
=> There are three such sectors so multiply this formula by 3 to get the length of all the three arcs!
=> now there are 6 radii (of same length). So add 6x to the formula and equate it to 60 cm!
2x + 6x = 60 (this is the equation in its simplest form)
From here find x.
=> 60/8 => 15/2 is the answer!

For 11(c)
Number of elements in the set (P n Q) U  (P n  R) = 3 (4, 3 & 2)
Total elements are 10!
So probability = 3/10

For question 22 (b)=> 15823.769 = 16000 (correct to 2 significant figure) and 0.0030489 = 0.0030 (to 2 significant figures)
So 16000 x 0.0030 = 50 ( 48 to 1 significant figure = 50)

For Question Question 21! have a look at this: viewtopic.php?f=25&t=8806&p=93390#p93390

You have so many doubts in just one paper!
Just have a look at Mark Scheme here and try them: http://www.xtremepapers.me/CIE/Cambridg ... _ms_12.pdf
If still you have doubts in them, let us know!

thanks alot Allah ap ko Jaza dai
some query why u multiply by 2 in this 40/360 * 2 * 3 * x
and
4) The temperatures, in °C , at midnight on 10 consecutive days were
4, 1, 0, –2, –1, –3, 1, –2, 3, –1.
(b) How many of these temperatures are within 2.5 °C of 1 °C ??????

15) In a sale, a shopkeeper reduced the marked price of his goods by 20%.

(b) The price of a camera in the sale was $60.
Calculate its marked price.?????

 

[OakMoon!]

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

Here is the procedure for finding the vectors components.



For AnotherStudent.

 

[ibadsiddiqi]

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

help needed with question 26 of http://www.xtremepapers.me/CIE/Cambridg ... 4_qp_1.pdf

 

[Usman17]

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

Can SOmEBODY PLEASE TELL ME how to find discount price and marked price... and what is the difference b/w the two... pleaseeeee!!

 

[Firebender]

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

can someone explain this qs to me? thanks in advance:

F(x)= 5 - 2x/3x

find f^-1(x)

 

[CaptainDanger]

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

help needed with question 26 of http://www.xtremepapers.me/CIE/Cambridg ... 4_qp_1.pdf

(a) Its a stretch as you can see that the image area has changed after translation... It would be shear if it remained same... To find stretch factor... Length of image/ length of object = 8/4 = 2 so the answer is it is a stretch along x axis with stretch factor 2...

(b) i- Y axis has remained same so it is 0 and x axis count how far it has gone... Or simply subtract the initial coordinates from the final ones... Writing the anwer in column vectot... (8 , 0)

ii- a- To find shear factor... Image distance of the point B can be seen in the graph... Point B image distance from B / distance to B from invariant line = 8/2 = 4 Using scale factor you can find the image coordinates of A and C... A will remain same its on the invariant line... For C... Scale factor = image distance of C* from C / distance from the invariant line to C...
4 = image distance of C* from C / -2
image distance of C* from C = -8 Count from C towards negative x axis the coordinates of C* (-7,-2) Draw the image then...

b- Shear factor is 4 already found in the previous part....

There are many ways of solving transformations... I hope you get it, I am not good at explaining things...

 

[ibadsiddiqi]

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

Thanks a million captain!

 

[CaptainDanger]

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

Can SOmEBODY PLEASE TELL ME how to find discount price and marked price... and what is the difference b/w the two... pleaseeeee!!

To find always use this (new price/ original one) into 100%... Discount price is to be subtracted from the marked price... It will become the sale price... Marked price is what is written on the object when the discount price is subtracted from it the new price becomes sale price...

 

[CaptainDanger]

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

can someone explain this qs to me? thanks in advance:

F(x)= 5 - 2x/3x

find f^-1(x)

y=5-2x/3x
y(3x)=5-2x
3xy+2x=5
take x common
x(3y+2)=5
x= 5/3y+2
f^-1= 5/3y+2
f^-1(x)= 5/3x+2

The main point is taking common... Same type questions come when they ask for making something subject of the equation...

 

[CaptainDanger]

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

Thanks a million captain!

You are welcome...

 

[Usman17]

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

Hey Guyz... Please solve these doubts for me.......!! Thnx in advance...
1) First of all tell me how to calculate discount price and marked price... is there any diff. b/w the two and tell the formula as well...

2) And next is a question from D03/p1: Its question 20 b part ii.. In this question tell me why arent we squaring the ratio of heights coz height in not same so we shud square it and answer shud be 2... But here its given 6... Please do explain...

3..) If two sides are similar of a triange, then is the 3rd side also similar?? Reference J05 p1/ q 21 b...
Thnnku...