Ms$.$ Jackson gave her students a biology test last week. Here are the test scores for each of the eighteen students.

$\backslash$table$[[$Test scores$],[74,70,86,67,80,83,],[68,85,81,69,87,70,],[70,80,82,83,71,87,]]$

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$($a$)$ Complete the grouped frequency distribution for

$($b$)$ Using the classes from part $($a$),$ draw the frequency the data. $($Note that the class width is $6.)$ polygon for the data. Note that you can add or remove classes from the figure. Label each class with its midpoint.