Here's a question I'm pondering today.
A running club found that 20% of runners withdraw from a marathon without completing the race. 20 runners have registered for a mini-marathon.
What is the probability that more than three runners will withdraw?
I think I need to use a binomial distribution function. My question is, how do I treat the 'more than three' part of the question? If 20% of 20 runners drop out, that means we think that four runners will drop out, correct? So, do I use the binomial function for the values (3) and (4), and add them together? I just wanted to make sure I account for all parts of the question. Any ideas?
A running club found that 20% of runners withdraw from a marathon without completing the race. 20 runners have registered for a mini-marathon.
What is the probability that more than three runners will withdraw?
I think I need to use a binomial distribution function. My question is, how do I treat the 'more than three' part of the question? If 20% of 20 runners drop out, that means we think that four runners will drop out, correct? So, do I use the binomial function for the values (3) and (4), and add them together? I just wanted to make sure I account for all parts of the question. Any ideas?