How many words make up 45 percent of everything written in English?

The most common Words in English, known as high-frequency Words, make up about 45% of all written English text. These Words are typically short, functional Words such as "the," "of," "and," "to," and "in." The specific number of Words that make up this percentage can vary slightly depending on the source and methodology used to determine high-frequency Words, but it generally falls within the range of 100-200 Words.