Answer:
Step-by-step explanation:
Frequency table for the height of the seedlings,
Height (in inches) Â Â Â Â Number of seedlings
     [tex]\frac{1}{2}[/tex]                    2       Â
     [tex]\frac{3}{4}[/tex]                    4
     [tex]\frac{5}{8}[/tex]                    2
     [tex]\frac{7}{8}[/tex]                    2
Now we can draw the line plot as attached.
Average height of the seedlings = [tex]\frac{2(\frac{1}{2})+4(\frac{3}{4})+2(\frac{5}{8})+2(\frac{7}{8})}{2+4+2+2}[/tex]
                           = [tex]\frac{1+3+1.25+1.75}{10}[/tex]
                           = [tex]\frac{7}{10}[/tex]