When do we take 1-Z-score and when do we not?

Take (1−z)when: Left Tail with Negative z-score: If the question asks for the left tail (less than a certain value) and the z-score is negative, convert it to a positive value. Since there are no negative numbers in the standard table, the positive value represents the right tail. To find the left tail, use 1-
z

 * Right Tail with Positive z-score: When finding the right tail (e.g., x
>0.58, since the table only provides left tail values, take 1−z.

 Do NOT take ( 1-z- score) when: * Right Tail with Negative z-score: If you're looking for the right tail and the z-score is negative, simply convert it to a positive value. The bell curve is symmetric, so no need for 1
 * Left Tail with Negative z-score: If you need to find the value for the left tail (less than 0), just use the table directly with the positive value.