This is the “bell-shaped” curve of the Standard Normal Distribution.
It is a Normal Distribution with mean 0 and standard deviation 1.
It shows you the percent of population:
between 0 and Z (option “0 to Z”)
less than Z (option “Up to Z”)
greater than Z (option “Z onwards”)
It only display values to 0.01%
The Table
You can likewise utilize the table beneath. The table shows the territory from 0 to Z.
Rather than one LONG table, we have put the “0.1”s running down, at that point the “0.01”s running along. (Case of how to utilize is beneath)
![The standard normal distribution table [18]. | Download Table](https://www.researchgate.net/profile/Meral_Bayraktar/publication/287353635/figure/tbl2/AS:669590002606096@1536654105767/The-standard-normal-distribution-table-18.png)
Example: Percent of Population Between 0 and 0.45
Start at the row for 0.4, and read along until 0.45: there is the value 0.1736
And 0.1736 is 17.36%
So 17.36% of the population are between 0 and 0.45 Standard Deviations from the Mean.
Since the bend is balanced, a similar table can be utilized for values going either bearing, so a negative 0.45 additionally has a territory of 0.1736
Example: Percent of Population Z Between -1 and 2
From −1 to 0 is the same as from 0 to +1:
At the row for 1.0, first column 1.00, there is the value 0.3413
From 0 to +2 is:
At the row for 2.0, first column 2.00, there is the value 0.4772
Add the two to get the total between -1 and 2:
0.3413 + 0.4772 = 0.8185
And 0.8185 is 81.85%
So 81.85% of the population are between -1 and +2 Standard Deviations from the Mean.
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