The incubation time for a breed of chicks is normally distributed with a mean of 20 days and standard deviation of approximately 3 days. Look at the figure below and answer the following questions. If 1000 eggs are being incubated, how many chicks do we expect will hatch in the following time periods? (Note: In this problem, let us agree to think of a single day or a succession of days as a continuous interval of time. Assume all eggs eventually hatch.) use graph for reference (a) in 14 to 26 days = _______ chicks (b) in 17 to 23 days = _______chicks (c) in 20 days or fewer = _______chicks (d) in 11 to 29 days = _________ chicks
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!
The incubation time for a breed of chicks is
(a) in 14 to 26 days = _______ chicks
(b) in 17 to 23 days = _______chicks
(c) in 20 days or fewer = _______chicks
(d) in 11 to 29 days = _________ chicks
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