Hello. I just do not get ahead.

Here's the task:

In opinion surveys, only about 80% of the selected persons are found by experiment. What is the probability encountered by 1,200 people, more than 900?

In this task, you have to apply the Gaussian integral function. (P x> equal 901) = 1-Φ (-4.22)

But there are no values for Φ (-4.22). Something's wrong.

## The best answer

The question is (also) why there is "no values". Because values there are, of course, but they are no longer in the usual tables inside. And why? Because Φ (-4.22) is so small already, that the first four decimal places are all 0th Accordingly your desired probability is already so close to 1 that you can specify them with 1 (to make it clear that this is a rounded value is just not exactly 1, you can also write 0.9999 ...).

(My TR are on the binomial a Wkeit of 0.9999855 ... to.)

However, there are of course. You just have to convert ...

http://de.wikipedia.org/wiki/Normalverteilung#Grundlegende_Fragestellungen