SolGiven the list of 15 measurements:
-18, -97, 63, 96, -78, 81, -25, 41, 78, 1, 76, 30, -14, 22, 44
Where the measurements are respectively labeled x1, x2, .......x15.
x1 = -18
Let's compute the given summation:

To compute the summation, we have:
![\begin{gathered} \sum_{i\mathop{=}1}^(15)(x_i+47)=(-18+47)+(-97+47)+(63+47)+(96+47)+(-78+47)+(81+47)+(-25+47)+(41+47)+(78+47)+(1+47)+(76+47)+(30+47)+(-14+47)+(22+47)+(44+47) \\ \\ \end{gathered}]()
Solving further, we have:

Thus, we have:
= 29 - 50 + 110 + 143 - 31 + 128 + 22 + 88 + 125 + 48 + 123 + 77 + 33 + 69 + 91

Therefore, the value is 1005.
• ANSWER:
1005