An elementary school teacher learned that 40 percent of scho

An elementary school teacher learned that 40 percent of school age children have at least 3 cavities. The teacher has 34 students in his class. How many students would he expect in his class to have at least three cavities? (Round your answer(s) to 3 decimal places.) Number of students

Solution

Here binomial distribution will be used. Since 40% of scholl age chidlren have at least 3 cavities so we have p=0.40. And since in the class there are 34 students so n=34. Therefore expected number of students having at least three cavities is np = 34 * 0.40 = 13.6