関連ワード:  what is the line in a box plot    what is the line in a box plot called    what is the line in a box plot mean    what is the middle line in a box plot    what is the line in a box and whisker plot    what is the center line in a box plot    what is the horizontal line in a box plot    what is the black line in a box plot    what is the vertical line in a box plot    what is the middle line in a box plot called