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On a standardized exam, the scores are normally distributed with a mean of 190 anda standard deviation of 20. Find the z-score of a person who scored 155 on the exam.

Respuesta :

Step 1

State an expression for the z-score

[tex]z=\frac{x-\mu}{\sigma}[/tex]

Where

[tex]\begin{gathered} \mu=\operatorname{mean}=190 \\ \sigma=\text{ Standard deviation}=20 \end{gathered}[/tex]

Step 2

Find the z-score when x = 155

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