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# s1- normal distribution watch

1. i do understand chapter 9 (normal distribution) but i sometimes get the answer wrong,
i am not sure which table to use the normal or inverse normal,
when do you use inverse normal
2. (Original post by unstabledean0)
i do understand chapter 9 (normal distribution) but i sometimes get the answer wrong,
i am not sure which table to use the normal or inverse normal,
when do you use inverse normal
You typically use the normal distribution to work out a probability. You work out where you are in the normal distribution (often called a "z-value" ) and then you work out the probability of being greater than or equal to (or sometimes less than or equal to) that value of z.

You use the inverse when you have the complementary problem. You are given a probability and you want to work out where you would have to be in the normal distribution (i.e. a value of z) in order to have obtained that probability.

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Updated: February 11, 2016
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