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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

 Apr 3, 2019
 #1
avatar+6042 
+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

 Apr 3, 2019
 #2
avatar+104444 
+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.

 Apr 3, 2019

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