Spell-checking software will catch nonword mistakes but not word mistakes. Human proofreaders catch 70% of word mistakes. You ask a fellow student to look over an essay in which you have deliberately made12word mistakes. What is the smallest number of missesmwithP(Xm)

no larger than 0.05? You might considermor more misses as evidence that a proofreader actually catches fewer than 70% of word mistakes.