Question

what is the mean of the data set: 8.9, 9.4, 8.6, 9.1

Explanation:

Step1: Sum the data

$$8.9 + 9.4+8.6 + 9.1$$
$$=(8.9 + 9.1)+(9.4 + 8.6)$$
$$=18+18$$
$$=36$$

Step2: Divide by the number of data points

There are \(n = 4\) data points. The mean formula is \(\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}\). So \(\bar{x}=\frac{36}{4}\)

Answer:

\(9\)