Check my working

[TrueTears]

It's not too bad as I said, but I always like to define everything

Yeah, always define your variables... unless its a conventional term, anything else that you made up needs to be defined.

[kenhung123]

Thanks for that TT, I also want to ask, do we need to put answers under common denominator if the answer obtained contains 2 fractions?

[Blakhitman]

Thanks for that TT, I also want to ask, do we need to put answers under common denominator if the answer obtained contains 2 fractions?

I never do that cause I'll most likely do some stupid mistake like expand wrong or something -.-

[TrueTears]

haha loving the trivialities of VCE maths, in uni if you have a huge sum like 234784 + 176234... blah blah, there's no need to simplify, as long as that's the arithmetic needed to get the answer it's fine.

Now with regards to your question, it really depends, if you have something like I don't see why you shouldn't put it under a common denominator.

If you have messy stuff then you would probably leave it. Unless it's on exam 2 and you can easily use the common denominator function on your TI-89 or inspire or whatever calc you use.

[kenhung123]

yea like stuff with pi's and surds

[kenhung123]

Please check my working for this particular probability problem that involves solving for St Dev and mean.
Let X=weight of tomatoes in grams

so and
(Not sure if I should state what I am doing here or not but heres the next line):
and
So Z=1.64485 and -1.28155

As , and
Solving gives ...answer

[Martoman]

Mention that you are using invnorm to get z.

Apart from that what you have done is perfect.

[kenhung123]

Thank you

[kenhung123]

Ok a few more working issues:
When you are asked to find some x value and round it, Hence find the corresponding y value, does you use the rounded value?

What happens if you use wrong terms in your working as sometimes I get too carried away with x's and forgetting to use t's which a question is based around?

Sometimes I have issues with getting exact answers with my calculator...is there anyway around this? Does it mean if I use 4dp I would not get any answer marks?

[m@tty]

I'd say you should be as exact as possible, unless the question specifically asks you to use the rounded value.

You'd lose a mark.

You must assume that everything is required in exact form, unless specified otherwise.

[Blakhitman]

I'd say you should be as exact as possible, unless the question specifically asks you to use the rounded value.

You'd lose a mark.

You must assume that everything is required in exact form, unless specified otherwise.

And usually, if exact value is required, the answer is obtained by doing the question by hand.

[m@tty]

Except now with the wretched CAS calculators exact answers can be found at the press of a button.

[kenhung123]

Hmm ok thanks for advice

[the.watchman]

On that note, I thought I might share something we did in class

Find the exact general solutions of using calculator

It's in the study design, very interesting

[98.40_for_sure]

On that note, I thought I might share something we did in class

Find the exact general solutions of using calculator

It's in the study design, very interesting

I entered it into my calc about 10 minutes ago, it's still solving...

EDIT: finally it finished, and theres about 6 solutions... some arctan ones and some other shit