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Author Topic: S1 and S2 DOUBTS HERE!!!!  (Read 54267 times)

Offline astarmathsandphysics

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Re: S1 DOUBTS HERE!!!!
« Reply #75 on: May 26, 2010, 04:07:51 pm »
I dont have the cie 2001 jun paper. Can you upload it here?
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Offline Blizz_rb93

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Re: S1 DOUBTS HERE!!!!
« Reply #76 on: May 26, 2010, 04:16:51 pm »
Quote from: astarmathsandphysics on May 26, 2010, 04:07:51 pm
I dont have the cie 2001 jun paper. Can you upload it here?
not the cie the edexcel
6683 code
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Offline astarmathsandphysics

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Re: S1 DOUBTS HERE!!!!
« Reply #77 on: May 26, 2010, 04:40:45 pm »
sd=sqrt(sum x^2/n -mean^2)
=sqrt(46625/25-(1075/25)^2)=4
mistak in question sum x^2 should be 46625.
Dont blame me. I only stole them
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Offline T.Q

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Re: S1 DOUBTS HERE!!!!
« Reply #78 on: May 26, 2010, 04:41:34 pm »
Quote from: Psyclax on May 26, 2010, 04:16:51 pm
not the cie the edexcel
6683 code

Each of the 25 students on a computer course recorded the number of minutes x, to the nearest minute, spent surfing the internet during a given day. The results are summarised below.

            \sum x=1075,\sum x^2=46625

(a) Find \mu and \sigma for these data.                         
(3)  
Two other students surfed the internet on the same day for 35 and 51 minutes respectively.

(b) Without further calculation, explain the effect on the mean of including these two students.             


for part a  

\mu=\frac{1075}{25}

\mu=43

\sigma^2=\frac{46625}{25}-(43^2)
\sigma=4
« Last Edit: May 26, 2010, 04:44:25 pm by T.Q »
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Offline Blizz_rb93

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Re: S1 DOUBTS HERE!!!!
« Reply #79 on: May 26, 2010, 04:45:50 pm »
Quote from: T.Q on May 26, 2010, 04:41:34 pm
Each of the 25 students on a computer course recorded the number of minutes x, to the nearest minute, spent surfing the internet during a given day. The results are summarised below.

            \sum x=1075,\sum x^2=46625

(a) Find \mu and \sigma for these data.                         
(3)  
Two other students surfed the internet on the same day for 35 and 51 minutes respectively.

(b) Without further calculation, explain the effect on the mean of including these two students.             


for part a  

\mu=\frac{1075}{25}

\mu=43

\sigma^2=\frac{46625}{25}-(43^2)
\sigma=4

nvm nvm!! lol
thank you T.Q!!
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Offline Saladin

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Re: S1 DOUBTS HERE!!!!
« Reply #80 on: May 26, 2010, 05:10:10 pm »
FROM NOW ON, ALL QUESTION PAPERS WILL BE ASSUMED TO BE EDEXCEL, UNLESS TOLD OTHERWISE.
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Offline Blizz_rb93

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Re: S1 DOUBTS HERE!!!!
« Reply #81 on: May 26, 2010, 07:36:37 pm »
edexcel june 2009 question 3
i dont understand how they got the width
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Offline insane.kid

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Re: S1 DOUBTS HERE!!!!
« Reply #82 on: May 26, 2010, 08:14:13 pm »
Hello ppl i have som doubts plz can u try to solve them they are :
1) year 2002 june 6th question
2) year 2005 june 4th question
3) year 2007 june 2e) with explanation and reason

Plz reply soon ppl and best of luck for ur exam :D
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Offline Saladin

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Re: S1 DOUBTS HERE!!!!
« Reply #83 on: May 26, 2010, 08:22:44 pm »
Quote from: insane.kid on May 26, 2010, 08:14:13 pm
Hello ppl i have som doubts plz can u try to solve them they are :
1) year 2002 june 6th question
2) year 2005 june 4th question
3) year 2007 june 2e) with explanation and reason

Plz reply soon ppl and best of luck for ur exam :D

answering now.
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Offline insane.kid

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Re: S1 DOUBTS HERE!!!!
« Reply #84 on: May 26, 2010, 08:32:55 pm »
Thanks you Engraved for ur help cld u even help in normal distribution or if u have any good notes cld u plz attach it thanks a ton though :D may God bless u and ur exam goes well :)
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Offline Saladin

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Re: S1 DOUBTS HERE!!!!
« Reply #85 on: May 26, 2010, 08:59:57 pm »
Quote from: insane.kid on May 26, 2010, 08:14:13 pm
Hello ppl i have som doubts plz can u try to solve them they are :
1) year 2002 june 6th question
2) year 2005 june 4th question
3) year 2007 june 2e) with explanation and reason

Plz reply soon ppl and best of luck for ur exam :D

June 2007

The mean is the average of the 3 quartiles=45

\frac{X-\mu}{\sigma}=Z

\frac{54-45}{\sigma}=0.67

Check the log table for the step above.

13.43
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Offline insane.kid

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Re: S1 DOUBTS HERE!!!!
« Reply #86 on: May 26, 2010, 09:09:11 pm »
Engraved y did u pick 54 or how did u knw u had to takee tht ?
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Offline Blizz_rb93

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Re: S1 DOUBTS HERE!!!!
« Reply #87 on: May 26, 2010, 09:42:32 pm »
how do we calculate the width and the height of a rectangle representing a group class modal ???
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Freaked12

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Re: S1 DOUBTS HERE!!!!
« Reply #88 on: May 26, 2010, 09:44:11 pm »
I just did CIE S1 today
so if you could just write down the whole question i will FOR SURE solve it
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Offline T.Q

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Re: S1 DOUBTS HERE!!!!
« Reply #89 on: May 26, 2010, 09:54:03 pm »
Quote from: Psyclax on May 26, 2010, 07:36:37 pm
edexcel june 2009 question 3
i dont understand how they got the width

u have to find out the scale factor
 or solve it proportionally   
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