• 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)

Maths, Addmaths and Statistics: Post your doubts here!

K

Kamihus

Messages
930
Reaction score
2,173
Points
253
black widow said:
http://papers.xtremepapers.com/CIE/Cambridge International O Level/Statistics (4040)/4040_w12_qp_22.pdf
cud anyone plz answer question 3 with complete steps
thankx
Click to expand...
Take the mid-value of each given time and convert hours into minutes.
Add up all the times: 175*5+185*14+195*7+205*4=5650
Divide by total members: 5650/30=188.33
Take to the nearest minute and convert back into hours: 188 minutes or 3 hours and 8 minutes

I have no idea why assumed mean was given there as I haven't studied Stats, I solved it all without it.
 
black widow

black widow

Messages
1,341
Reaction score
5,963
Points
523
Kamihus said:
Take the mid-value of each given time and convert hours into minutes.
Add up all the times: 175*5+185*14+195*7+205*4=5650
Divide by total members: 5650/30=188.33
Take to the nearest minute and convert back into hours: 188 minutes or 3 hours and 8 minutes

I have no idea why assumed mean was given there as I haven't studied Stats, I solved it all without it.
Click to expand...

yup that is the way
but i have asked my friend and he gave me the solution with the assumed mean
cud u explain the answer to question 7 (iv) (b)
dont understand it
 
K

Kamihus

Messages
930
Reaction score
2,173
Points
253
black widow said:
yup that is the way
but i have asked my friend and he gave me the solution with the assumed mean
cud u explain the answer to question 7 (iv) (b)
dont understand it
Click to expand...
Sorry, but without studying Stats I'm unable to understand the idea of systematic sample.
 
M

Muhammad Usamah

Messages
4
Reaction score
6
Points
3
Kamihus said:
Take the mid-value of each given time and convert hours into minutes.
Add up all the times: 175*5+185*14+195*7+205*4=5650
Divide by total members: 5650/30=188.33
Take to the nearest minute and convert back into hours: 188 minutes or 3 hours and 8 minutes

I have no idea why assumed mean was given there as I haven't studied Stats, I solved it all without it.
Click to expand...
The question says to used assumed mean. If u haven't studied Stats, u shouldn't be answering. It misguides some people.
Actual mean = Assumed mean + Mean of deviations
Mean of deviations=sum of deviations/no. of deviations
Deviation= Midpoint - Assumed Mean
 
black widow

black widow

Messages
1,341
Reaction score
5,963
Points
523
Muhammad Usamah said:
In a systematic sample, u first divide 600 by 6, which gives u 100.
any number from the first 100 is randomly selected i.e. from 000 to 099
every 100th successive number is then selected.
the answer is 08
Click to expand...

Muhammad Usamah said:
The question says to used assumed mean. If u haven't studied Stats, u shouldn't be answering. It misguides some people.
Actual mean = Assumed mean + Mean of deviations
Mean of deviations=sum of deviations/no. of deviations
Deviation= Midpoint - Assumed Mean
Click to expand...

thankx dude but i got the solutions from a friend and understood it
 
A

AAAYY***

Messages
47
Reaction score
16
Points
8
can anyone help me with question 17 part c , question 18 part c and question 22 of may/june 2011 paper 11
 

Attachments

  • 4024_s11_qp_11.pdf
    141.5 KB · Views: 5
M.Omar

M.Omar

Messages
1,243
Reaction score
1,891
Points
173
Not entirely relevant to this thread but for all u math lovers...U wud need a thought shower on this one..Can u solve this..Just to provoke u all,i challenge u ;) (By the way ,did it in abt 2 days u know well concentrating on it for abt 2.5 hrs in total,estimation ;) )..Have fun20130302_122433-1.jpg20130302_122433-1.jpg open in new thread if u want to..But solve it entirely by urself..cheers ;)
 
You must log in or register to reply here.
Top