Mathematics: Post your doubts here!

[ahmed abdulla]

do they really give 3d figues of these kinds of questions or it is the first time? and my research on internet told me that we need multivariable calculus to find centre of mass of a 3d object. wtf?

you dont actually need calculus to do it

 

[Suchal Riaz]

you dont actually need calculus to do it

Okay. I am still trying to learn to solve these kinds of question.

 

[Suchal Riaz]

you dont actually need calculus to do it

After wasting so much time, i have learned the chapter of centre of mass.
I did the firet part.mit wasn't difficult. But couldn't do the socond part. And i have to idea how it has to be done. I have reached the equations present in marking scheme but they have assumed 0.36 to be the centre of mass of the new cylinder. And i can't figure out how and why. A lot of time has been wasted so now i am moving to my real studies.

 

[ahmed abdulla]

After wasting so much time, i have learned the chapter of centre of mass.
I did the firet part.mit wasn't difficult. But couldn't do the socond part. And i have to idea how it has to be done. I have reached the equations present in marking scheme but they have assumed 0.36 to be the centre of mass of the new cylinder. And i can't figure out how and why. A lot of time has been wasted so now i am moving to my real studies.

your try is much appreciated!

 

[itallion stallion]

This question is not from past papers it's from advanced level statistics by J.crawshaw and chambers.
Page no
Page 377 q6 and 9.
Q6)bags of flour packed by a particular machine have masses which are normally distributed with mean of 500g and standard deviation of 20g.2% of the bags are rejected for being underweight and one percent of the bags are rejected for being overweight?between what range of values should the mass of a bag of flour lie if it has to be accepted.


Q9)mean=400 and standard deviation is 8
A)find the limits within which the central 95% of the distribution lies.
B)find the inter quartile range of the distribution.



Plz solve these questions.thanks a lot!!

 

[adaalhaider]

Can i get a compiled form of all formulas, i have mock exam coming soon really need it

 

[Suchal Riaz]

Can i get a compiled form of all formulas, i have mock exam coming soon really need it

Look at the end of syllabus. All formulas are written there

 

[snowbrood]

After wasting so much time, i have learned the chapter of centre of mass.
I did the firet part.mit wasn't difficult. But couldn't do the socond part. And i have to idea how it has to be done. I have reached the equations present in marking scheme but they have assumed 0.36 to be the centre of mass of the new cylinder. And i can't figure out how and why. A lot of time has been wasted so now i am moving to my real studies.

your try is much appreciated!

 

[snowbrood]

your try is much appreciated!

Look at the end of syllabus. All formulas are written there

 

[iwoeriuyure]

oct nov 09 paper 62 question no 1

 

[wohooo]

Someone help me 9709/m/j/31/10 no 7ii abd 7iii.tq

 

[Suchal Riaz]

I would try to answer any question posted here only if the link to the paper is attached or the snapshot of the question is attached.

 

[Melancholic Poet]

I would try to answer any question posted here only if the link to the paper is attached or the snapshot of the question is attached.

what an attitude.

 

[josephsai]

pls i seriously need complete notes on math paper 3 vectors anyone? thank you

 

[RadzMau]

Hey

I would try to answer any question posted here only if the link to the paper is attached or the snapshot of the question is attached.

Can you please solve this Statistics 1 question on probability? Your help will be much appreciated. Thanks

 

[RadzMau]

Hello Everyone!
Kindly please solve this Statistics 1 question on probability.
Thanks

 

[wohooo]

 

[wohooo]

• http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s10_qp_32.pdf no 8ii
  

 

[Suchal Riaz]

i have not done S1. i will use my o level knowledge to do it.
(i) if anyone wins the first one, the probability of the same person winning the game is clearly 1/2
(ii) there's only one way this can happen. the one who wins the first one loses the second and third. so it is 1/2 * 1/2 = 1/4
(iii) i guess there is again only one possibility: first he wins, second loses, third wins and fourth wins. so 1/2 * 1/2 * 1/2 = 1/8
(iv) well win lose win lose win is the only possibility as any other way the game will end just there. it will be by sequence (1/2)^4

there is no way the game can go on after 5 games.
the cost will be i guess 18/100.

 

[Talha Irfan]

i have not done S1. i will use my o level knowledge to do it.
(i) if anyone wins the first one, the probability of the same person winning the game is clearly 1/2
(ii) there's only one way this can happen. the one who wins the first one loses the second and third. so it is 1/2 * 1/2 = 1/4
(iii) i guess there is again only one possibility: first he wins, second loses, third wins and fourth wins. so 1/2 * 1/2 * 1/2 = 1/8
(iv) well win lose win lose win is the only possibility as any other way the game will end just there. it will be by sequence (1/2)^4

there is no way the game can go on after 5 games.
the cost will be i guess 18/100.

the answers given do not follow the required proper technique to solve S1 questions, however they seem to be correct except the last part