CREATE TABLE table_7335 ("Census Year" FLOAT, "Number of Muslims '000" FLOAT, "Population of England and Wales '000" FLOAT, "Muslim  ( % of Total population ) " FLOAT, "Registered Mosques" FLOAT, "Muslims per mosque" FLOAT)

What is the highest population of England and Wales that has less than 50 Muslims?
SELECT MAX("Population of England and Wales '000") FROM table_7335 WHERE "Number of Muslims '000" < '50'
SELECT MAX("Population of England and Wales '000") FROM "table_7335" WHERE "Number of Muslims '000" < '50'