The deviation of a value (x) from the mean of the sample divided by the standard deviation (s)of the sample is known as the "z" value or z-score.

1. true
2. false

true.

Explanation:

z-score gives an idea of how far the value of data is from the mean point. Basically is the measure of a standard deviation below or above the mean.

More the deviation of the data from the mean more is the standard deviation.

Z-score or value is calculated by the expression given below:

  x is the value

 μ is the mean

 σ is the standard deviation

Hence, the statement given is true.

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e/c, where e is its total energy