What is the z value and why we use the z score?

I was stuck in understanding this while I was preparing tell me about the z value or z score.
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In data, a Z-ranking can be a standardised rating that will suggests the quantity of standard deviations some sort of datum is actually from your bastardly.
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With statistics, a typical report indicates by how several typical deviations a great observance as well as datum is definitely above or below the bastardly.
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