Answer:
1.5
Step-by-step explanation:
To find the mean, we must add all of our terms, and then divide by the number of terms.

Solve:

Since we have seven terms, we must divide our total (
), by seven.
÷ 
Solve:
÷ 
Therefore, the mean is 
Answer:

<em>solve the squared numbers</em>
<u></u>
<u></u>
<u></u>
<u></u>

<em>subtract 64 from 289</em>

<em>square root 225</em>


<em>simplify that</em>



Step-by-step explanation:
B²=a²+c²
12²=4.2²+c²
144=16.4+c²
144-16.4=c²
127.6=c²
√127.6=√c²
11.3=c
1000.000+100.000+10.000+1.000+.100+.010+.001