Forums › Ask ACCA Tutor Forums › Ask the Tutor ACCA MA – FIA FMA › Normal distribution

- This topic has 5 replies, 3 voices, and was last updated 3 weeks ago by John Moffat.

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- February 10, 2023 at 8:14 pm #678707
A normal distribution has a mean of 150 and a standard deviation of 20.

Required

80% of the population is therefore below what ?February 10, 2023 at 8:47 pm #678738They must be below the value that is 30% above the mean. Therefore you use the tables to determine the z value for 0.3 (30%) and then multiply by the standard deviation and add the result to the mean of 150.

I explain all of this in my free lectures on the normal distribution.

February 21, 2023 at 1:09 pm #679334Hey john !

Residential block has 30 apartment of which 29 are occupied .The mean annual salary is $27000. The last apartment is then occupied by resident with an annual salary of $26100

What would be the new annual mean salary of the residents?February 21, 2023 at 4:36 pm #679343Why are you attempting a question for which you do not have an answer? You should be using a Revision Kit from one of the ACCA Approved Publishers – it has answers and explanations.

Your question has nothing to do with the normal distribution.

At present, the total of all the salaries is 29 x $27,000.

In future the total of all the salaries will be $26,100 more than at present, and in future there will be 30 apartments. So dividing one by the other will give the new annual mean salary.

February 22, 2023 at 11:29 am #679390Hey john this mcqd relate to high low method

True or false

Assume that factor other than activity can affect cost?

High low method assumes linear relation between cost and revenue

Unusually high low output level can distort result?

Relies on past data and assumes this can predict future cost?

Plz tell reason with ans!February 22, 2023 at 4:45 pm #679409In future you must start a new thread when you are asking about a different topic. This has nothing to do with the normal distribution. (The reason is that many students use the search box in order to see if their problem has already been answered.)

Again, you must have an answer in the same book in which you found the question, so ask about whatever it is in the answer that you do not understand and then I will explain.

Have you watched my free lectures on correlation and regression, because I explain all of this in the lectures? The lectures are a complete free course for Paper MA and cover everything needed to be able to pass the exam well 🙂

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