Mathematics: Post your doubts here!

[fatima 007]

Most difficult question in s1? Lets solve

 

[angelicsuccubus]

is anyone staying up the night?

 

[fatima 007]

duude my paper is at 10 am! i don't have time to wake up and practice :/ what ever i can finish now is all the revision i can do at the moment its 9:40 pm i dont have time

You have s1 in the morning?

 

[fatima 007]

is anyone staying up the night?

bad idea! you need a fresh mind to do s1! Especially the latest papers. Requires a lot of thinking!

 

[umarFM]

Most difficult question in s1? Lets solve

do u hv any???

 

[angelicsuccubus]

bad idea! you need a fresh mind to do s1! Especially the latest papers. Requires a lot of thinking!

I do m2

 

[RGBM211]

cudnt do the probability one sorry im getting 2/49 as ans

it will be 2c1/7c1

 

[omar hazem]

when lets say, u are given...a fixed nmber of trial eg a dice is thrown 200 times.... use a suitable approximation to find the probability that more than 60 times it landed on a 3..... or when u hv all the binomial related data ie; number of trials....probability of success and failure...and u need to find the probability of a large event.......

u mean that they give to me a large fixed number of trials and i need to find the probability of a smaller number so we use in this case continuity correction ??

 

[tasnim007]

Is it just me or is M2 actually easier than P3?

 

[AdeelRox]

due can an of u plx help me with Q.5, p61 part (i)

 

[Esme]

box-and-whisker plots can be drawn eithr horizontally or vertically right ???
cuz in class i've done vertically but in the mark scheme its always horizontal.
any help is appreciated.

 

[shan5674]

You have s1 in the morning?

Nope i do s2 which is at 10am

 

[Mobeen]

in normal distribution if for example its given to find the probablity of X>35 and mean = 30 and variance = 1.5. sometimes it takes it as 35-30/1.5 and sometimes 35.5-30/1.5 .. why is that ??
the values are just random.

 

[umarFM]

u mean that they give to me a large fixed number of trials and i need to find the probability of a smaller number so we use in this case continuity correction ??

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w11_qp_61.pdf
Q1 look at this question.... u hv fixed nmber of trial.... probability of success and failure....all the data fr binomial...u need to find the probability for more than 210....u jst cant add 0 to 210 ways.....an approximation is needed....hence u cnvrt frm binomial to normal.....

 

[AdeelRox]

guys can any of u plx help me with q.5 part (i)
paper 61

 

[hm12]

in normal distribution if for example its given to find the probablity of X>35 and mean = 30 and variance = 1.5. sometimes it takes it as 35-30/1.5 and sometimes 35.5-30/1.5 .. why is that ??
the values are just random.

thats continuity correction its being discussed all over the last few pages its always applied when you convert binomial into normal usually when its written in the question use suitable approximation then its applied

 

[omar hazem]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_61.pdf
Q1 look at this question.... u hv fixed nmber of trial.... probability of success and failure....all the data fr binomial...u need to find the probability for more than 210....u jst cant add 0 to 210 ways.....an approximation is needed....hence u cnvrt frm binomial to normal.....

ahaaaaaaaaaaaaaa thank u so much now i understood so we use the cc when u need to find the probability of a smaller number in relative to a larger fixed number am I right?

 

[hm12]

guys can any of u plx help me with q.5 part (i)
paper 61

you did not mention the year?

 

[AdeelRox]

2011

 

[AdeelRox]

november