It means a number less than zero.
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z-score of a value=(that value minus the mean)/(standard deviation). So if a value has a negative z-score, then it is below the mean.
The mean is that value that is most commonly referred to as the average.The typical value is a synonym for the mean and average.The typical value is the mean.
non-negative would be any number that is greater than or equal to zero.
You consider both cases, then the variable is positive and when it is negative. For example, |x|
evaluate means to figure out the value of something