Hey there! 
Your mean is known as your average / total. To find your mean you have to ADD the total numbers you have in your data plot then DIVIDE it by the total number you have in your set. 
FORMULA: 
sum of numbers ÷ total numbers = mean
YOUR EQUATION: 
MEAN = 6 + 14 / 2 
MEAN = 20 / 2 
MEAN = 10
Therefore, your answer is: 10
Good luck on your assignment & enjoy day! 
~Amphitrite1040:)