That means "Greetings from holidays/vacation"
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A z score of .5 corresponds to 19% of the data between the mean and z. P( 0 < z < .5) = .19
The Z Value, or Z Score, does not apply to the mean, it is a representation of a piece of data. z = (x-µ)/sigma
z value=0.44
z-score of a value=(that value minus the mean)/(standard deviation). So a z-score of -1.5 means that a value is 1.5 standard deviations below the mean.
moybe their name starts with a z, OR it looks cool