The Spache Readability Formula† is designed to categorize reading materials for grades 1 through 3. For a passage of text, the variables are S, the number of sentences, W, the number of words, and U, the number of unfamiliar words (words not on a specific list). The formula (as revised) for the grade level is
Grade level = 0.121
+ 0.082U + 0.659
(b) What is the maximum possible number of sentences?
(c) What is the minimum number of sentences that would put this passage at the second-grade level?