Melody

Thanks very much Heureka,

Those formulae  2 and 3 that you have used, do you have those memorised?

I mean can they be derived easily enough? 

I do not remember seeing them before....

Hello! I can not arct find. how to count arct 186.7-172 / 0.4 * 20 =

it fights (degrees, minutes, seconds), for example 94 ° 12'30 "

Mmm not sure what you are asking.

Ммм не уверена, что ты просишь.

186.7-172 / 0.4 * 20 = = -8413.3

I also offer a calculator aid to help although this may not be what you need.

Look in thew sticky topics on the left and open the post called 'reference material'

Now scroll down to the heading "Other Calculators"

There is one there called "z score probabilities - this is great"

Try that and you should be able to answer your questions I think.

There are many great things in the sticky topic posts, especially in 'reference material' one.

I do not think either of those sites would be helpful in answering this question PM!

I do not think that you have included the whole question.....

Yes, that is right :)

I guess he/she can keep the name :))

Hi PartialMathematician, welcome to the forum.

In a couple of years time are you going to change your name to FullMathematician ?  LOL

On a serious note:

Please put some effort into learning to presenting your questions properly.

The stuff between the dollar signs is LaTex code.

If you delete the dollar signs you can past the rest into the LaTex box that will appear when you click [LaTex] in the ribbon.

After you hit ok it will present properly.

Note:

Just delete the stuff that is in the box when you open it.

o kiek butu -2,7 dvyliktuoju : -0,3 dvyliktuoju atsakymas      (Lithuanian detected)

and how many would be -2.7 twelfth: -0.3 the twelfth answer 

\(\frac{-2.7}{12}\;:\;\frac{-0.3}{12}\\ -2.7:-0.3\\ 27:3\\ 9:1\)

That is if I understand your question properly.

Tai yra, jei aš tinkamai suprantu jūsų klausimą.

So far I have not worked out how to derive those initial formulas that were given.

I have not looked at the rest of your logic yet, I'd really like to convince myself of the accuracy of the book extract first :/

Hi Old Timer,

We are no ignoring your question (part 2 that is).  Chris and I just have not worked out how to do it yet.  

Hopefully Heueka or Alan or Tiggsy or some other clever member or guest will show us all how it is done (hopefully in a nice easy to follow fashion.) 

Edit:

I hope I haven't offended anyone by using names. Maybe Rom or ElectricPavlov or Omi or geno or  ...   We have lots of very knowledgable people here now days.