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

- This topic has 1 reply, 2 voices, and was last updated 3 years ago by John Moffat.

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- January 19, 2021 at 4:03 am #607070
in example 3 dealing with tables backwards how did you come to the conclusion that 95% is less than 10cm as opposed to it being above 10cm?

I have understood almost everything like how to we came to the answer, except that little bit. how do you know whether to add the z score to the mean or to subtract it?.January 19, 2021 at 6:35 am #607091Best is to draw yourself a little sketch 🙂

The question asks for X where the probability of being more than X is 95%. Therefore X must be below the average of 10cms. We know that there is a 50% chance of being above the average of 10cms and therefore there must be a 45% chance of being between X and the average.

Since there is a 50% chance of being below the average there must be a 5% chance of being below X.

(Have you watched the lectures working through this chapter of the lecture notes?)

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