Theoretical Probability and Let's do an experiment. Toss a coin 10 times and count the 12 12 Something Else number of tails (t) and heads (h). The theoretical probability says 50%-50%, so how many of you got five tails and five heads? You probably will be surprised but the last time I did this in class , out of the 22 students participating, only 6 of them got 5t and 5h. I also added all tosses and the result was: out of 220 tosses, we got 102t and 118h which is much closer to 50%- 50%. What do you think? Why only six out of the 22 results confirmed the theoretical probability? We even had results like 8:2 - can we say that such coins are not fair coins? Why is the result of 220 tosses much closer to 50%-50%, when these are the same coins? Share your thoughts. Normal Distribution or not Exactly V You have recently taken a statistics exam and your instructor 0 0 just returned your graded exam. The instructor announced that 70% of the students scored below the mean. How do you reconcile this with the fact that, in a normal distribution, half of the scores should be below the mean and the other half should fall above the mean? 19