Question

what is the mean of this set {2, 6, 7, 9, 9, 9}?
6
7
8
9

Explanation:

Step1: Calculate the sum of the data set

$$2 + 6+7 + 9+9+9=42$$

Step2: Calculate the number of data points

There are \(n = 6\) data points.

Step3: Calculate the mean

The formula for the mean \(\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}\), so \(\bar{x}=\frac{42}{6}=7\)

Answer:

7