A new drug that has been on the market for only a few months is now being recalled because certain people are suffering severe side effects. Which of the following is a possbile statistical explanation from the clinical trials for this observation in the real world?

	a.	The average (mean) effectiveness of the drug was lower than not taking the drug in trials
	b.	The sample of the population in trials was not representative of all people taking the drug.
	c.	The mean and median effectiveness were equal in clinical trials
	d.	The percentage distribution of people taking the drug correctly in trials is normally distributed