To find the **z-score**, you need to know the mean (\(\mu\)) and the standard deviation (\(\sigma\)) of the dataset. The z-score formula is:

\[
z = \frac{X - \mu}{\sigma}
\]

Where:
- \(X\) is the value you're looking at (in this case, 27 books),
- \(\mu\) is the mean of the dataset,
- \(\sigma\) is the standard deviation of the dataset.

Please provide the **mean** and **standard deviation**, and I'll calculate the z-score for you.

Would you like any details or have more questions?

Here are 5 related questions:
1. What is the purpose of using a z-score?
2. How do you interpret the meaning of a z-score in terms of standard deviations?
3. How is the normal distribution related to the z-score?
4. What are some common z-scores and their interpretations?
5. How would you calculate the standard deviation for this dataset?

**Tip:** The z-score tells you how many standard deviations away a value is from the mean.

Learn how to calculate the z-score for 27 books using the standard formula z = (X - μ) / σ. Understand key concepts such as mean, standard deviation, and how the z-score relates to standard normal distribution. Suitable for high school students in Grades 10-12.

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