The expression P(z<1.45) represents the area under the standard Normal curve below the given value of Z.
What is P(z<1.45) ?
I'm just curious.
This is about the most basic thing you can do when learning statistics. Use the z-score table to
look up the associated probability.
Did no one show you how to do this? Do you not have a table available? (hint they are all over the web)
Do you not care at all that you don't learn how to do this? How's that going to work on a test?
Here's a table. http://www.z-table.com/uploads/2/1/7/9/21795380/9340559_orig.png
When using one that only has the negative side you just remember that
P[z] = 1-P[-z] so
P[1.45] = 1 - P[-1.45]
and you use the table to look up P[-1.45]
In Beccca's defence, this is often not explained well.
Plus people with very little maths ability are expected to work this out.
Maybe watching a couple of videos might help you understand Beccca.
Here is an early one.
Watchi it and see if it helps you understand. It leads to other more advanced ones too.