5.8. A machine fills packages of flour. The exact quantity that is filled into the packages follows a normal distribution with mean 1003 g and standard deviation 5g. a) Calculate the probability that the filled quantity is less than 995g. b) Calculate the approximate probability that the filled quantity is between 1001.35 and 1001.45g without using R. c) Find the filling quantity that is exceeded by 99% of all packages.
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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