Hi

You do pretty much the same thing for all of these.

I assume you have some basic knowledge here, understandning that you

have a normalized variable z, with mean 0 and standard deviation 1.

can be calculated using a distribution table. (Google, wikipedia etc).

In this you look up that the probability that is approximately 0.9893.

But you have also that .

And

So 0.9893-0.5 = 0.4893