Question

the following is a list of 6 measurements.
20, 9, 18, 14, 17, 12
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suppose that these 6 measurements are respectively labeled $x_1, x_2, \dots, x_6$. compute the following.
$\sum\limits_{i=1}^{6} x_i$

Explanation:

Step1: Understand the summation

The symbol $\sum_{i = 1}^{6}x_{i}$ means we need to sum all the 6 measurements $x_1, x_2, \dots, x_6$. The measurements are 20, 9, 18, 14, 17, 12.

Step2: Add the numbers

We add them one by one: $20 + 9 + 18 + 14 + 17 + 12$. First, $20+9 = 29$. Then, $29+18 = 47$. Next, $47+14 = 61$. Then, $61+17 = 78$. Finally, $78+12 = 90$.

Answer:

90