Prefered or Preferred: How To spell?

The word Prefered is misspelled against Preferred, which is past tense of "Prefer"

Preferred has double "rr" is mispronounced as "r"
Remember double 'RR' in between the strings prefe & ed which should not be misspelled with single 'R'
Wrong Spelling: prefe-r-ed
Correct Spelling: prefe-rr-ed
Explore spell check of Preferred to spell without errors.