Hey there!
Your mean simply means, your average….
To find it you have to ADD all of your numbers and DIVIDE it by the total number you have in your data plot.
3 + -10 + -2 + 13 + 11 / 5
= 3 - 10 - 2 + 13 + 11 / 5
= -7 - 2 + 13 + 11 / 5
= -9 + 13 + 11 / 5
= 4 + 11 / 5
= 15 / 5
= 3
Therefore, your answer should be: 3
Good luck on your assignment & enjoy your day!
~Amphitrite1040:)