A biologist measured the lengths of hundreds of cuckoo bird eggs. Use the relative frequency distribution below to answer the questions that follow. What is the probability that one of the eggs selected at random was at least 19.75 mm long but less than 21.75 mm long?
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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Lengths of Cuckoo Bird Eggs
Length (in millimeters)
Percent of eggs
18.75-19.75
0.8
19.75-20.75
4.0
20.75-21.75
17.3
21.75-22.75
37.9
22.75-23.75
28.5
23.75-24.75
10.7
24.75-25.75
0.8
GB 8
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