Final answer:
A z-score of -1.00 corresponds to a position below the mean by a distance equal to 1 standard deviation in the standard normal distribution.
Step-by-step explanation:
A z-score represents the number of standard deviations a value lies from the mean in a distribution. In the case of a z-score of -1.00, this corresponds to a position below the mean by a distance equal to 1 standard deviation. This metric is a central concept within the standard normal distribution, which is characterized by a mean of 0 and a standard deviation of 1 (notated as Z ~ N(0, 1)). A z-score of -1 indicates that the value falls below the mean, demonstrating it is less common than the average occurrence in a data set that follows a normal distribution.