What is the average relative permeability with a resistivity smaller than 1.12 and a surface resistance relative to copper smaller 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 AVG("relative_permeability") FROM "skin_depth_at_24_k_hz" WHERE "resistivity_10_6_ohm_inches"<1.12 AND "surface_resistance_relative_to_copper"<1;