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**Answer**

Depending on what the distribution represent z score is calculated as shown below:-

Z- score of a population

$z=\frac{x-\mu}{\sigma}$

Z- score of a sample

$z=\frac{x-\mu}{s}$

Example:-

Given a sample of 50 individuals with a mean of 50 and standard deviation of 10, a z score of 60 will be calculated as:-

$z=\frac{x-\mu}{s}$

$z=\frac{60-50}{10}=\frac{10}{10}=1$

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