Ztable.io is a convenient tool designed to help users quickly calculate probabilities in a normal distribution from a z-score table. Whether you're a student or a professional working with statistics, this program provides an efficient way to find the percentage of values below a given z-score in a standard normal distribution.

With Ztable.io, you have two options to input your z-score value. You can either use the slider provided, or manually enter the z-score in the input field. Once you have entered the z-score, the program will display the percentage of values below or above this value in a standard normal distribution.

What sets Ztable.io apart is its additional features. In addition to the z-score lookup, you can also compute probabilities between two z-scores. This is particularly useful when you need to determine the likelihood of a range of values in a standard normal distribution. Furthermore, the program allows you to calculate a z-score by entering a test value, a mean value, and a standard deviation. This feature is beneficial for those who need to convert raw data into z-scores.

Ztable.io also provides comprehensive information on how to use both positive and negative z-tables. This ensures that users can fully understand and utilize the tool's capabilities, even if they are unfamiliar with z-score tables.

Overall, Ztable.io is a valuable resource for anyone working with z-scores and normal distributions. Its user-friendly interface and range of features make it a convenient and efficient tool for calculating probabilities in a standard normal distribution.