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- This topic has 1 reply, 2 voices, and was last updated 7 months, 2 weeks ago by John Moffat.

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- October 17, 2019 at 10:04 pm

ivie2019ParticipantHI!

Can someone please explain to me how do I calculate questions like this one?The results of an accountancy exam are normally distributed with a mean score of 58 and a standard deviation of 10.

What is the percentage probability that a student will score more than 80 (to 2 decimal places)?OR

A probability of 2.28% will have been determined from the normal distribution table. The normal distribution value which will give this probability is 0.4772 (0.5 – 0.0228)

This value equates to a Z-score of 2 from the normal distribution table.

Z-score = (x – µ)/?

2 = (90 – 70)/?

? = 20/2 = 10I am just looking for some formula someone could explain it to me.

I keep having these kind of questions.

I have already ask John one of these questions but I havent really understand anything from his answer.Just now I had again similar question in Mock test

The number of daily complaints to a local government office has a standard deviation of 7 and the coefficient of variation is 20%.

What is the mean number of daily complaints?Is there any videos, resources etc which could explain it to me step by step.

Thank youOctober 18, 2019 at 7:47 am

John MoffatKeymasterOf course there are videos explaining. My free lectures explain how to do this in detail and I suggest that you watch them. I suggested this to you when I answered your previous question, but it seems you have not bothered to watch.

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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