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5.1 The Normal Distribution - normal distribution pdf


5.1 The Normal Distribution-normal distribution pdf

5.1 The Normal Distribution
Many variables tend to be distributed as a
normal distribution:
Weights, heights, IQ scores, etc.
1
Day of birth relative to due date
This is a histogram
for a distribution of
300 natural births.
The left vertical axis
shows the number of
births for each 4-day
bin (as a count). The
right vertical axis
shows relative
frequencies.
Relative frequency
Due Date
(base line as 0) 2
Day of birth relative to due date
The shape looks like
a normal distribution:
one peak
symmetric
`bell-shaped'
Due Date
(base line as 0) 3

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