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For a normal variable $X$ with mean $\mu$ and standard deviation $\sigma$ which is the standard normal variable $Z$ for it?

• A
  $Z=\frac{x-\sigma}{\mu}$
• B
  $Z=\frac{\sigma-x}{\mu}$
• C
  $Z=\frac{\mu-x}{\sigma}$
• ✓
  $Z=\frac{x-\mu}{\sigma}$