Class frequency

5-29---------------2
30-54--------------------3 3
55-79--------------------4

80—104 5


105-129 2

130-154 1

155-179 1

PC =3(X-Median)/s
median = L +((N/2) – CF)/f *(h)
L=55
(N/2)=9
h=24 f= 4
It is says that median is 77.5, and I could not find it.
I'm not even mention X or s in the Pearson Coefficient or PC,
There is a graph, the points are in the bottom

4.5 29.5
54.5
79.5
104.5
129.5
154.5
179.5