Mathematics: Post your doubts here!

[sweetyrox]

The probability of a letter being >12g above the mean is 0.94+(0.06/2)=0.94+0.03=0.97
What u are taking is 0.94 which is the probablity of the letters being within 12g of the mean but what u have to take is the probabality of the letters being MORE than 12g above the mean!

how do u get 0.06??

 

[ppaayas]

Help

 

[hassam]

http://www.xtremepapers.com/papers/...S Level/Mathematics (9709)/9709_w11_qp_62.pdf
q4.....wat wud be class boundaries....in this case if asked

 

[hassam]

well this is wat i read smwhere on yahoo answers The class boundaries are found by taking the average of the highest value of one class and the lowest value of the next class

 

[Diamona151294]

The probability of a letter being >12g above the mean is 0.94+(0.06/2)=0.94+0.03=0.97
What u are taking is 0.94 which is the probablity of the letters being within 12g of the mean but what u have to take is the probabality of the letters being MORE than 12g above the mean!

oh finally! THANKU!

 

[hassam]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_62.pdf
q4.....i think i resolved it.....see....less than 40 and less than 45 interval.........wat this means that the lower class limit will be 40 AND UPPer will be less less than 45 meaning 44.9999999999999999999999,,,,,,approximately 45.....THATS why he saying 40-45.......and for this ODD question class boundaries will be same as these class limitssssss

 

[Diamona151294]

how do u get 0.06??

c 1-0.94= 0.06
in the curve the area in the middle is 0.94, and 0.06 is split equally along the edges on each side ie 0.06/2
so in taking below 32 or above 12, u add one of the sides 0.94+0.03. and then find the z value.

 

[Diamona151294]

help asap! expalin only part ii of Q2 and whole 3...... please!

 

[Mustehssun Iqbal]

help asap! expalin only part ii of Q2 and whole 3...... please!View attachment 10663

answers??

 

[Zishi]

http://www.xtremepapers.com/papers/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_62.pdf
q4.....wat wud be class boundaries....in this case if asked

They will be 20, 30, 40, 45 and so on...

 

[Diamona151294]

help asap! expalin only part ii of Q2 and whole 3...... please!View attachment 10663

 

[hassam]

answers??

not independent cos p(male)=18/30 and p(watching)=16/30.......p(male and watching)=13/30.......so ........their product is not equal to 13/30 thats why not independent

 

[hassam]

q3.....is easy......draw a probaility distributio table and then bingo....obviously u cant use np here for expevcctation cos its not a binomial case

 

[umarFM]

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?

provided u r doing the question in binomial before...

 

[JulyMei]

Thanku soooooooooooooo much!!!!!! gdluk for ur paper!!
oh um 1 thing, can u exp why we multiply the probability by 70?

because they said 70 days. if im not mistaken..

sorry.. went to college this morning. couldn't reply u..

 

[omar hazem]

good luck for all of us in achieveing the best marks in today exam, it was normal to easy exam but please no one review here the answers so we don't discover silly mistakes

 

[Esme]

good luck for all of us in achieveing the best marks in today exam, it was normal to easy exam but please no one review here the answers so we don't discover silly mistakes

yep i agree... plzzz no discussions. ppr is done now. cant be changed so its no use.

 

[angelicsuccubus]

well .. my m2 paper went like crap.. flunked it literally.. hope it wasnt the same for s2

 

[2pac]

anyone here doing s2?

 

[omar hazem]

yep i agree... plzzz no discussions. ppr is done now. cant be changed so its no use.

yeah surely we all like to have the same happiness so no one say answers making us sad
thnx all and good luck for coming exams