Customers make purchases at a convenience store, on average, every six minutes. It is fair to assume that the time between custo purchases is exponentially distributed. Jack operates the cash register at this store. a-1. What is the rate parameter A? (Round your answer to 4 decimal places.) Rate parameter A a-2. What is the standard deviation of this distribution? (Round your answer to 1 decimal place.) Standard deviation < Prev 10 of 11 Next >
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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