How to calculate area using left and right Z table

We need to find the left  area of the Z score 0.70 ,see the below.screenshot for more idea

First we will find area by using below left Z table.

Step 1:

        If we have any second level decimal values like 0.71 then we need to split in to 0.7 and 0.01, see the above table you can see 0.7 in the column and 0.01 in the row.

Step 2:        

In our case we need to find 0.7, means we need to search 0.7 in the column and 0.00 in the row.

        The value is 0.7580 which is 75.8%

Now let’s find the same 0.7 area by using Right z table:

Step 1:

        Form the above table for 0.7 the value is 0.2580 which means 25.8%

Step 2:

        Now we need to add 50% or 0.5 with the value we found in Right Z table, because from mean to left it is 50% and to right its 50%., we find the value of 0.7 using right Z table which is under the 50% and to get the full area till 0.7 we need to add 50% .

        So now the area will be 0.2580+0.5=0.7580=75%

We have seen how to calculate the area using Right and Left Z table