Question

find the mean for the following group of data items. 125, 65, 95, 65, 85 the mean is □ (type an integer or a decimal.)

Explanation:

Step1: Recall mean formula

The mean $\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}$, where $x_{i}$ are data - points and $n$ is the number of data - points.

Step2: Calculate sum of data

The data set is $125,65,95,65,85$. The sum $\sum_{i = 1}^{5}x_{i}=125 + 65+95+65+85=435$.

Step3: Determine number of data

The number of data - points $n = 5$.

Step4: Calculate the mean

$\bar{x}=\frac{435}{5}=87$.

Answer:

87