[填空题]
The following cumulative frequency diagram shows the lengths of 80 p op(oe +)q ou)o.oxr+83jm qhfieces 8 jjkqn(ic8sq5oni94of string,jkns4q j(i8oci589 q n in cm.
1.Find the median length.
The following frequency table also gives the lengths of the 80 pieces of string.
2.(1)Write down the value of q.
(2)Find the value of p.