How many districts had an depravity level of 27.7
CREATE TABLE "notes" (
  "district" text,
  "2010_population_000" real,
  "2008_gdp_usd_bn_a" text,
  "2008_gdp_per_capita_usd_a" real,
  "agri_culture_b" text,
  "mining_b" text,
  "manufac_turing_b" text,
  "services_cons_truction_b" text,
  "exports_usd_mn_2011" real,
  "median_mo_salary_usd_a_e" real,
  "vehicles_per_1000_d" real,
  "income_poverty_f" text,
  "structural_poverty_g" text
);
SELECT COUNT("district") FROM "notes" WHERE "income_poverty_f"='27.7';