Submitted by pmagunia on September 2, 2017 - 9:20 PM

## Computing the Average

To compute the average, $\bar{x}$, we must sum all the observations in the column X1 and then divide by the number of observations.

First, let us list the observations in column X1. The first ten observations include:
66, 100, 84, 85, 14, 20, 64, 85, 43, 18.

We have a total of 10 observation(s). So, $n =10.$

Now, $\bar{x} = \frac{\sum\limits_{i=1}^n x_i}{n}.$

$\sum\limits_{i=1}^n x_i = \sum\limits_{x=1}^{10}x_i = 66 + 100 + \cdots + 18 = 579.$

Therefore, $\bar{x} = \frac{\sum\limits_{i=1}^n x_i}{n} = \frac{66+100+ \cdots + 18}{10}=57.9.$

So, $\bar{x} =57.9$.

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