Let's calculate the mean and standard deviation for the given data set:

Weights of the books: {24, 23, 19, 17, 12, 14, 14, 28, 23}

Step 1: Calculate the mean

The formula for the mean is:

$\text{Mean} = \frac{\text{Sum of all values}}{\text{Number of values}}$

$\text{Mean} = \frac{24 + 23 + 19 + 17 + 12 + 14 + 14 + 28 + 23}{9}$

Let's calculate it.

Step 2: Calculate the standard deviation

The formula for standard deviation (for a sample) is:

$s = \sqrt{\frac{\sum (x_i - \mu)^2}{n - 1}}$

Where:

• $x_i$ = individual data points
• $\mu$ = mean of the data set
• $n$ = number of data points

Now let's calculate the values.