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) ?

A. 0.0735

b. 0.0749

c.0.9251

d.0.9265

Beccca17 Apr 3, 2019

#1**+1 **

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]

good luck

Rom Apr 3, 2019

#2**+1 **

Hi Rom,

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.

https://www.youtube.com/watch?v=xgQhefFOXrM

Watchi it and see if it helps you understand. It leads to other more advanced ones too.

Melody Apr 3, 2019