Maths, Addmaths and Statistics: Post your doubts here!

[soumayya]

Re:

nov07P2Q2(ii)

P (either A or B) = P(A) + P(B) - P(A
intersection
B)
= 0.3 + 0.6 - 0.18 = 0.72

P (both A and B) = P( A intersection B ) = 0.18

P (either A or B but not both occurs) = 0.72 - 0.18 = 0.54

 

[soumayya]

Re: O'level Maths, Addmaths and Statistics help available he

nov08P1Q7(i)b & Q10(iii)

Frequency Density = Frequency / class width
= (6+9) / 3 cm(representing 15 Kg)
= 15 / 3 = 5 cm

 

[soumayya]

Re: O'level Maths, Addmaths and Statistics help available he

nov08P1Q7(i)b & Q10(iii)

# Frequency Density = Frequency / class width
= (6+9) / 3 cm(representing 15 Kg)
= 15 / 3 = 5 cm

# greatest difference between the number of patients is around waiting time 10 min

 

[soumayya]

Re: O'level Maths, Addmaths and Statistics help available he

nov08P2Q7(v)

P (they live in the same house with no other people) = 16/110 * 1/110

in zis ques, u hve 2 tke ze people living by 2...so, in choosing ze 1st person, u hve 2 choose among 16 people from 110 residents of ze village..when choosing ze 2nd person, u hve no choice but 2 tke his mate, thus 1 of the 109 remaining residents...

Hpe it hlps...

 

[aleezay]

Re: O'level Maths, Addmaths and Statistics help available he

nov08P1Q7(i)b & Q10(iii)

Frequency Density = Frequency / class width
= (6+9) / 3 cm(representing 15 Kg)
= 15 / 3 = 5 cm

im sorry but i stil dnt get whered u got dat 3 from..

 

[aleezay]

Re: O'level Maths, Addmaths and Statistics help available he

im dun with d pastpapers uptil 2000...shal i solve pastpapers ov d prev decade(i have thm) or shal i solve d igcse stats papers?
n wat shud i do next?iv gone thru 2 bux,solved papers of d past 10yrs...what next?

 

[Muktak98085]

Re: O'level Maths, Addmaths and Statistics help available he

in the triangle abc, ab=12 cm, angle bac=60 degree and angle acb=45degree. Find the exact length of bc PLEASE DOO IT FAST

 

[Silent Hunter]

Re: O'level Maths, Addmaths and Statistics help available he

aleezay : u giving maths this oct 2011?

 

[SalmanPakRocks]

Re: O'level Maths, Addmaths and Statistics help available he

nov08P1Q7(i)b & Q10(iii)

Frequency Density = Frequency / class width
= (6+9) / 3 cm(representing 15 Kg)
= 15 / 3 = 5 cm

im sorry but i stil dnt get whered u got dat 3 from..

C.W (We will multiply the multiple of lowest number with all)
10 * 2
5 * 1
5 * 1
10 * 2
10 * 2
20 * 4
So after we have merged the class we will add the C.W so 2+1=3
therefore
F.D = F/C.W
= 15/3 = 5cm
hope u get it.

 

[soumayya]

Re: O'level Maths, Addmaths and Statistics help available he

in the triangle abc, ab=12 cm, angle bac=60 degree and angle acb=45degree. Find the exact length of bc PLEASE DOO IT FAST

By sine rule, BC/sin bac = AB/sin acb
BC / sin 60 = 12 / sin 45
BC / (√ 3/2) = 12 / (1/√ 2)
BC * (2/√ 3) = 12 * √ 2
BC = (12 * √ 2 * √ 3) / 2
BC = 6√ 6
Hpe it hlps...

 

[CaptainDanger]

Re: O'level Maths, Addmaths and Statistics help available he

in the triangle abc, ab=12 cm, angle bac=60 degree and angle acb=45degree. Find the exact length of bc PLEASE DOO IT FAST

Apply the sine rule

AB/Sin 45 = BC/Sin 60 Find BC!

 

[aleezay]

Re: O'level Maths, Addmaths and Statistics help available he

aleezay : u giving maths this oct 2011?

nope.im giving stats..

 

[Jai4ever]

Re: O'level Maths, Addmaths and Statistics help available he

HELP!!!!!!!!!!!!!

 

[aleezay]

Re: O'level Maths, Addmaths and Statistics help available he

(i)i got the same answers..i thnk this is how u calculate u
(52-u)/10 = (106-100)/12
12(52-u) = 10(6)
624-12u = 60
12u = 624-60
u = 564/12 = 47

 

[aleezay]

Re: O'level Maths, Addmaths and Statistics help available he

i think d answers r correct..

 

[aleezay]

Re: O'level Maths, Addmaths and Statistics help available he

4 stats paper this year..do v have 2 prepare anythn NOT in the pastpapers??

 

[abcde]

Re: O'level Maths, Addmaths and Statistics help available he

Obviously, a question cannot come out of the syllabus. You don't have to prepare anything NOT in the sy and/or past papers.

 

[SalmanPakRocks]

Re: O'level Maths, Addmaths and Statistics help available he

Need urgent help in Statistic
N05/P2/Q5.

 

[aleezay]

Re: O'level Maths, Addmaths and Statistics help available he

(i) modal no of eggs=check d largest value in 'no. of hens' row = 6eggs
(ii) c.f = 8 20 29 36 44 50 53
median = (53+1)/2 = 27th value
which,4m d c.f table,is 7
(iii) the q says that d median doesnt change i.e. it remains 7.d max value 4 which d result wud stil b 7 is 29 (check d 3rd value in d c.f table)
and since median is placed in d centre,max no of hens = 29 x 2 = 58
therefore greatest value of N = 58 - d original no of eggs
=58-53
=5
hope this helped =)

 

[aleezay]

Re: O'level Maths, Addmaths and Statistics help available he

is method of least squares in time series included in the syllabus?