[3 pts.] Calculate the formation fracture gradient for the following conditions. Use the pressure data from Problem 1. What do you conclude from your results? Depth of Casing, ft Mud weight in use, ppg 9.0 9,300 16,000 13.9 15.1 13,100 6,400 9.5 [3 pts.] Calculate the formation fracture gradient for the following conditions. Use the pressure data from Problem 1. What do you conclude from your results? Depth of Casing, ft Mud weight in use, ppg 9.0 9,300 16,000 13.9 15.1 13,100 6,400 9.5