Question

what is the mean (average) of the data set?
data set
8, 8, 8, 12, 9
note: your answer should only be a number.

Explanation:

Step1: Find the sum of the data set

$$8 + 8+8 + 12+9$$
$$=16+8 + 12+9$$
$$=24+12 + 9$$
$$=36+9$$
$$=45$$

Step2: Find the number of data points

There are \(5\) data points (\(8,8,8,12,9\)).

Step3: Calculate the mean

The formula for the mean \(\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}\), where \(\sum_{i = 1}^{n}x_{i}\) is the sum of data and \(n\) is the number of data points.
So, \(\bar{x}=\frac{45}{5}\)

Answer:

\(9\)