Question

find the mean of this data set: 85, 90, 78, 92, 90

Explanation:

Step1: Calculate the sum of data

$$85 + 90+78 + 92+90=435$$

Step2: Count the number of data

There are \(n = 5\) data points.

Step3: Calculate the mean

The mean formula is \(\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}\), so \(\bar{x}=\frac{435}{5}=87\)

Answer:

\(87\)