• We need your support!

    We are currently struggling to cover the operational costs of Xtremepapers, as a result we might have to shut this website down. Please donate if we have helped you and help make a difference in other students' lives!
    Click here to Donate Now (View Announcement)

Mathematics: Post your doubts here!

ZaqZainab

ZaqZainab

Messages
1,764
Reaction score
3,472
Points
273
_Ahmad said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s13_qp_63.pdf Q6 (iii)
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_63.pdf Q3 (iii)
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s11_qp_61.pdf Q6 (iv)

In these above listed questions for finding mean we make intervals. So can you please tell how to make intervals in these questions.
Click to expand...
intervals for what? :confused:
the frequencies? the weights?
let me tell you what i do
for example Q6(iii)
For the weight which is x
add first with the second /2 and so on
so here (40+50)/2, (50+60)/2 , ...................<---x values
now for the frequencies
the second- first
so here
(12-0),(34-12).................
and then i use the equation in the data booklet mean= sum of fx /f
 
A

_Ahmad

Messages
186
Reaction score
332
Points
73
Weight (x kilograms) for the (first paper)
Mark (for the second paper)
Number of pupils in a school (for third paper)
 
ZaqZainab

ZaqZainab

Messages
1,764
Reaction score
3,472
Points
273
_Ahmad said:
Weight (x kilograms) for the (first paper)
Mark (for the second paper)
Number of pupils in a school (for third paper)
Click to expand...
ZaqZainab said:
For the weight which is x
add first with the second /2 and so on
so here (40+50)/2, (50+60)/2 , ...................<---x values

and then i use the equation in the data booklet mean= sum of fx /f
Click to expand...
for the first paper
for second
(10+20)/2 , (20+35)/2..........
for the third
100+150/2, 150+200/2 and so on
this is how i get x values
 
moonangel996

moonangel996

Messages
87
Reaction score
180
Points
18
S

saadgujjar

Messages
676
Reaction score
756
Points
103
_Ahmad said:
In the first part (for 36 values)
Σ(x − 45) = −148 and
Σ(x − 45)^2=3089

Now for finding sd of 37 values we need new Σ(x − 45) and Σ(x − 45)^2
x=29

(x-45)=29-45=-16
so new Σ(x − 45)= -148+(-16)=-164

(x-45)2=(29-45)^2=256
So new Σ(x − 45)^2 =256+3089=3345

now you got new values of Σ(x − 45) and Σ(x − 45)^2
so just apply the formula of sd to get the answer

Hope you got it
Click to expand...
great....thnx....and explain also the other question of combination
 
Rutzaba

Rutzaba

Messages
4,493
Reaction score
15,418
Points
523
u=cosx
du/dx= -sinx
dx= -du/sinx
change limits
if u =cosx
and x=pi/2
uper limit u=o
x=0
lower limit u=cos0=1
integrate
5sin^3 cos^2 * -du/ sin
cancelling sin
-5sin^2 cos^2 du
remember that 1-cos^2=sin^2
-5(1-cos^2)(cos^2) du
-5(1-u^2)(u^2)
-5(u^2 -u^4)
now integrate for0 to 1
-5( u^3)/3 +5(u^5)/5 put 0 to 1
0-(-5( u^3)/3 +5(u^5)/5 )
2/3 :/ wats the ans
Lostsoul
 
Last edited:
You must log in or register to reply here.
Top