What is the sum of skin depth with a resistivity of 1.12 and a relative permeability larger than 1?
CREATE TABLE "skin_depth_at_24_k_hz" (
  "material" text,
  "resistivity_10_6_ohm_inches" real,
  "relative_permeability" real,
  "skin_depth_inches" real,
  "surface_resistance_relative_to_copper" real
);
SELECT SUM("skin_depth_inches") FROM "skin_depth_at_24_k_hz" WHERE "resistivity_10_6_ohm_inches"=1.12 AND "relative_permeability">1;