Durations of human pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. The standard score for a pregnancy lasting 280 days is 280-268/15=.8 If Mary has a pregnancy lasting 280 days, find Mary’s percentile. Mary is in the _____________ percentile. What percentage of women have a pregnancy lasting longer than 259 days? Answer: _______________ % What percentage of women have a pregnancy lasting less than or equal to 238 days?
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!
Durations of human pregnancies are
The standard score for a pregnancy lasting 280 days is 280-268/15=.8
If Mary has a pregnancy lasting 280 days, find Mary’s percentile.
Mary is in the _____________ percentile.
What percentage of women have a pregnancy lasting longer than 259 days?
Answer: _______________ %
What percentage of women have a pregnancy lasting less than or equal to 238 days?
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