Carl Pride Parent (trying to help son with home work) suppose that in a statistics class of size 23, each student has a probability of passing of 73 percent. sample: What is the expected number of students who will pass?? What is the expected number of students three on either side of the expected value?? Not sure what formula to use or how to show in a graph. Hi Carl,You need to recognize that this is a binomial distribution, sometimes called repeated independent trials. The distinguishing features of a binomial experiment are:
In a binomial experiment the expected number of successes is np. In your son's problem this is 23(0.73) = 16.79. From here on I am not sure how to proceed, it depends very much on what they have been doing in class or what is in the textbook. I suggest that you look in his textbook for the section on binomial experiments, or repeated indepentent trials, or perhaps it is called Bernoulli trials. I hope this helps,Harley
