Traditionally, when students take a math class, about 70% of students in stats courses are successful. Suppose 25 students are selected at random from all previous students in this course. What is the probability that "more than" 15 of them will have been successful in the course?

A binomial experiment to see if this fits.

• A fixed number of trials -( what are these in our experiment and how many? )
• Each trial is independent of the others - ( are all trials independent and why? )
• There are only two outcomes - ( what are the only two outcomes?)
• The probability of each outcome remains constant from trial to trial. - ( what is this probability of success ?)