Answer:
Step-by-step explanation:
use the formula
E= 1/2 C

where E = energy in joules
C = capacitance
V = volts
we are given volts in the squared form , so, just plug in the number given
2*E / V = C
( I'm approximating the numbers off of the graph )
2(1300) / 630 = 4.126 F
so about 4 Farads :)