Many athletes (and their parents) worry about the risk of concussions when playing sports. A football coach plans to obtain specially made helmets for his players that are designed to reduce the chance of getting a concussion. Given are the measurements of head circumference (in inches) for the players on the team. Antwan, the team's starting quarterback, has a head circumference of 22.4 inches. 23.0 22.2 21.7 22.0 22.3 22.6 22.7 21.5 What is Antwan's percentile? 22.7 25.6 20.8 23.0 24.2 23.5 20.8 24.0 22.7 22.6 23.9 22.5 23.1 21.9 21.0 22.4 O 63.3rd percentile 23.5 22.5 23.9 23.4 21.6 23.3 O 19th percentile O 36.7th percentile O 76.7th percentile O 33.3rd percentile
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
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