exam Maths Puzzle Numerical Ability

Hello,
can someone tell me if I did this right.
thank you

Find for the following set of numbers:
-3.5, -1.4, -0.5, 3, 5, 1, 2
=-3.5+(-1.4)+(-0.5)+3+5+1+2
=-4.9+2.5+5+1+2
=-4.9+2.5+8
=-2.3+8
=5.7

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