The answer choices are
mean
median
mode
range

Mean: add all the numbers together and divide it by how many numbers there are

for plot 1:

2+3+3+4+6+9+9+9+11+11+12 = 79

There are a total of 11  numbers so divide 79 by 11

79 ÷ 11 = 7.18

for plot 2:

4+8+9+9+9+10+12+13+15+15+18 = 122

There are a total of 11  numbers so divide 122 by 11

122 ÷ 11 = 11.09

Median: Put the numbers in order from least to greatest and find the number in the exact middle

for plot 1:

2 3 3 4 6 9 9 9 11 11 12

3 3 4 6 9 9 9 11 11

    3 4 6 9 9 9 11

       4 6 9 9 9

          6 9 9

              9

for plot 2:

4 8 9 9 9 10 12 13 15 15 18

   8 9 9 9 10 12 13 15 15

       9 9 9 10 12 13 15

          9 9 10 12 13

              9 10 12

                  10

Mode: The number that appears the most

plot 1: there are three 9s

plot 2: there are three 9s

Range: Subtract biggest number by smallest number

plot 1:

12 - 1 = 11

plot 2:

18 - 4 = 14

The answer would be mode

Hope this helped!