The table below shows the number of endangered and threatened animal species in the United States as of November,30,1998. Mammals Birds Reptiles Amphibians Others Total Endangered 59 75 14 198 355 Threatened 15 21 17 69 120 Total 67 90 35 16 267 475 If an animal species is selected at random, find the probability that the animal species is an endangered, given that the animal species is a reptile. Select one: O a. 0.0394 O b. 0.4 O c. 0.0294 O d. 0.0474
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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