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I am getting confused about which formulas to use
for example, in frequency say there is a classroom of 40 students and frequency 20 has test mark 28 and frequency 40 has 31 test marks – which formula do you use to calculate the variance?
Also for ear say there is interest of 14.7 % compunded every 6 months which formula do you use?
It is too dangerous to just learn formulas like a parrot. You need to understand what is happening and then there is much less to actually learn (also the examiner deliberately asks questions that check you understand and have not just learned a formula).
However, our free lectures explain both of your questions in full.
The lectures are a complete free course for Paper MA and cover everything needed to be able to pass the exam well. If you are watching the lectures, then the only book you need to buy is a Revision Kit from one of the ACCA Approved Publishers. It is full of exam standard questions for practice after you have finished studying, and practice is vital for passing the exams.
I find these topics a bit confusing although may be very simple to others
For the ear what I find confusing is on the book for quarterly sometimes the square is 4 and sometimes 0.25 so I get doubt if I should do 1.147 to square 0.50 or 2 or 6? and then -1
For the variance correct like this?
20×8 = 760 n=40
40×31=124028+31 = 59 so mean = 59/40 = 1.475
than variance is square root (59-1.475) squared division 40?
Your question about the classroom is an impossible question.
You say that there are 40 students, and it is therefore impossible for 20 of them to get a mark of 28 and for 40 of them to get a mark of 31. That would mean that there are 60 students, not 40.
Again, have you watched the free lectures?
ok, must have copied the question wrong, however, I did watch your videos and found them very helpful together with your quick responses to questions, even more, helped me to clarify thoughts and doubts. Managed to pass MA exam so thankyou for your videos, notes and responses.
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