Page 419 - Math Smart - 7

Mean, Median, Mode and Range

First arrange the numbers in order by size.
Example: 3, 5, 5, 6, 8, 10, 12

Mean Median \/'k Range

The average of the The middle value In a The value that occurs The difference between
values in a data set. ranked set of data values. the most. the lowest and the
highest values.
1. Add all the values. The median is the middle Find the value that
value when the odd occurs most often in a Subtract the lowest value
2. Divide the sum of data set.
number of values are from the highest value.
the values by the
arranged in order of size. There may be more
number of values. than one mode.
For an even number of
values, the median is 12-3 = 9
There are two 5s and
3+5+5+6+8+ the average of the two
one of each of the
10+12 = 49
middle values.
other values.
49 + 7 = 7
The middle number is 6.
The mean is 7. The median is 6. The mode Is 5. The range is 9.
V, -2

Statistical
Measures of central tendency —^ Measure of spread
measures

horizontal or vertical representing grouped discrete
numerical data data
.
/ i
can be examples has
useful when type
gaps between
\
ar chart and / bars
bar-line graph Frequency
diagram no gaps between
presented as
to presented as \ bars
useful when
type t
I
show detailed \grouped
specific values
data and changes continuous data
are required a key to describe
in data over time
presented what each sector sectors that
represents
combine to form
presented as ^ complete circle
a
f
uses has
I
symbols instead Pie chart
comparisons between
of numbers to
shows parts of a whole more
represent data
a key to describe useful when effectively than bar
what each symbol charts
represents I
we want to compare
one amount to
another in a data set
415
mK \r.