Suppose that the creatine kinase levels among healthy males are normally distributed with a standard deviation of 23 units/L. Research shows that exactly 5 % of the healthy males have a creatine kinase level above 153 units/L. What is the mean creatine kinase level in healthy males?
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!
Suppose that the creatine kinase levels among healthy males are
23
units/L. Research shows that exactly
5
%
of the healthy males have a creatine kinase level above
153
units/L. What is the mean creatine kinase level in healthy males? Carry your intermediate computations to at least four decimal places. Round your answer to at least one decimal place.
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