The figure shows box plots of the marks of two classes, P and Q, on the same scale. Class P has the box from $40$ to $60$ with the median at $50$. Class Q has the box from $45$ to $85$ with the median at $70$. Which statement about the two classes is correct?

Fig. 1: Two box plots on the same scale from 0 to 100. Class P has a box from 40 to 60 with the median at 50 and whiskers from 20 to 80. Class Q has a box from 45 to 85 with the median at 70 and whiskers from 30 to 95.