Suggested solutions for Core, Graphs, Networks and Matrices

[Studyinghard]

is core 8 D? for sure

B

[Xavier1234]

is core 8 D? for sure

B on that. really absolutely 10000% sure

[scatteam_2]

It is C.

I'll explain why.

#1.    180 degrees is the 'median'.
#2.    Looking at the box plot, it is evident that it is skewed. Positively skewed.
#3.    The 68-95-99.7% rule, is a measure from the 'mean'!
#4.    We are unsure, but can guess the mean. (You could calculate, but it would take time).
#5.    Hence, as you are not sure of the Mean, because it is skewed the median does not equal
        the mean.
#6.    Therefore you use s= range/4  to obtain the standard deviation.

Viola:  Option C is correct.

I wouldnt say its skewed but more approximately symmetric therefore answer is B

I agree.  You needed it treat it as symmetrical...

the question specifically asks for the use the 68-97-99 rule
if it didnt, i would agree with u
but i think its b

[thompson]

isn't quest 11 of the core C?

[_avO]

It would be C, if 1/x wasnt an option (as it has the most correlation and is positive)

[_avO]

Nvm its still negative gradient I think.. not sure can't remember

[logix278]

Ummm Wtf 0.0 question 3 of matrices is not E it is B

[logix278]

and question 6 of matrices is B because you just times them together

[crayolé]

Ummm Wtf 0.0 question 3 of matrices is not E it is B

Nah its E, you needed to inverse it
Q6 was a trick question, it's C - Try working it out manually (calculate the time it takes Vince Rani or Nav to complete School A's jobs and it's the only matrix with matching values)

[_avO]

Ummm Wtf 0.0 question 3 of matrices is not E it is B

Q3 was a good one, it was basically testing your knowledge of how an inverse matrix would look like, which one would otherwise just chuck into the calc as A^-1C=X

[Dawson]

what was the change in graphs for the volume one?

[_avO]

75 L/hr

[sc92]

How is matrices question 9 'B'?!

Shouldn't it be 'E'?!

[_avO]

It asks which is true, and it's not possible to get exactly 3 answers that are the same. If you wrote out all 4 possible choices for the first question, (A,B,C,D) you can deduce that it is in fact B

[unstable1]

wat is the answer to q4 number pattersn cos we i do the formula i get B as the answer but manually it says D