Relative frequency histogram
a relative frequency histogram uses the percentage for
each class on the vertical axis instead of the frequency of
each class.
blood pressure reading
example 5:
notice instead of class boundaries, the midpoints have been
used on the horizontal axis.
relative frequency
0.20
0.15
0.10
what is the class width?
0.05
what are the class boundaries of the first class?
0.00
100 110 120 130 140 150
systolic blood pressure (mm hg
which class has the lowest relative frequency?
what is the class width?