Suggested Answers (and Discussion) of the Further Maths Exam!

[babushka818]

Can someone please explain why question 7 for matrices is d rather than c!

For example 50% of A remains at A. 50% next week will also. Some of these can overlap, so it's not necessarily true that they each change each week. C is only true is the leading diagonal has 0s (I think?)

[alex4928]

Matrices
8. E because you are calculating Rows not Columns

to calculate which is dominant you add columns not rows

[Sheri54371]

Question 7 for matrices was D because if you add up the percentage of people who will choose art in the long term it will show that 1.0 of the long term students will choose art, 1.1 will choose music, and 0.9 will choose sport. This is done by adding up the rows. So, the first row (art) is found: 0.5+0.4+0.1=1.0. Row 2 (music) is 0.3+0.4+0.4=1.1.  Row 3 (sport) is 0.2+0.2+0.5=0.9

Therefore as 1.1 is larger than 0.9, we can tell that a greater proportion of students will choose music over sport

[Sheri54371]

Question 7 for matrices was D because if you add up the percentage of people who will choose art in the long term it will show that 1.0 of the long term students will choose art, 1.1 will choose music, and 0.9 will choose sport. This is done by adding up the rows. So, the first row (art) is found: 0.5+0.4+0.1=1.0. Row 2 (music) is 0.3+0.4+0.4=1.1.  Row 3 (sport) is 0.2+0.2+0.5=0.9

Therefore as 1.1 is larger than 0.9, we can tell that a greater proportion of students will choose music over sport

[Sheri54371]

Question 7 for matrices was D because if you add up the percentage of people who will choose art in the long term it will show that 1.0 of the long term students will choose art, 1.1 will choose music, and 0.9 will choose sport. This is done by adding up the rows. So, the first row (art) is found: 0.5+0.4+0.1=1.0. Row 2 (music) is 0.3+0.4+0.4=1.1.  Row 3 (sport) is 0.2+0.2+0.5=0.9

Therefore as 1.1 is larger than 0.9, we can tell that a greater proportion of students will choose music over sport

[omcgil15]

Dominance you add rows not columns, so definitely A

[emkol]

challenges:!!
core: q2 - d-  as under 50 and over 50 are groups
q 24 - e -  because its still the middle of the annuity (whats she has given the banks) the Fv is also negative!!!
matrices: q8 - a - as i changed the original matrix to a defeating b and removing the 1 from b defeating a then i step 2 dominance it and a was the winner

someone explain:!!
core: q12 - why is it d? i said e
networks - q3 - why is it c? i said b
q7 - why is it b? i guessed e because it made 2 equal 11

thankyou

[mb]

Surely there's no natural ordering to age groups.

The Cambridge textbook uses it in a similar way to how it uses gender which is nominal too

[mb]

core: q12 - why is it d? i said e

A strong positive association suggests when one variable increases, so will the other

[mikaela98]

does anybody have a copy of the exam?? our school doesn't let us take it pls help

[omcgil15]

networks - q3 - why is it c? i said b

If you take off one more edge, the graph is still connected. There simply wont be an edge between two of the vertices, but the graph is still connected.

Example, this following graph is connected, even though there isn't an edge between the two outer vertices

   0-------0--------0-------0

[babushka818]

does anybody have a copy of the exam?? our school doesn't let us take it pls help

Pm me if you're on Facebook I can take pictures of my exam

[mikaela98]

Pm me if you're on Facebook I can take pictures of my exam

whats your facebook?? ill add you

[deejay9]

q 24 - e -  because its still the middle of the annuity (whats she has given the banks) the Fv is also negative!!!

Q2 seems to be quite contentious both here and on Facebook, however Q24 is definetely C. Using financial solver:

N: 60
I(%): 5.2
PV: -130784
Pmt: ?
FV: 66992.27
Ppy: 12
Cpy: 12

Pmt comes out as 1500.

[decentxion]

Anyone have a rational explanation of the Graphs & Relations q8?