The blood cholesterol levels in 14-year-old boys are approximately normally distributed. Within this curve, 99.7% of the levels, centered about the mean, are between 75 and 255 milligrams of cholesterol per deciliter of blood. The standard deviation is 30 milligrams of cholesterol. Use this information to estimate the mean blood cholesterol level in 14-year-old boys. Approximate the probability that a boy has a cholesterol level less than 135. Explain how you determined your answers.
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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