Transcript Mean, Median, Mode - Traverse Bay Area Intermediate School

Mean, Median, Mode
Section 1-6
Notes
• Measures of central tendency are ways to
understand the trend of the data by looking at
different measures of the center.
Notes
• Outlier – A Piece of data that is far outside the
normal range of data.
• Example: If we were measuring class heights
who would be an outlier?
Notes
• The mean or average is the sum of the data
divided by the amount of data.
• It can be affected by outliers
Notes
• The median is the middle number of a set of
data. It is not affected by outliers. The data
must be in order.
• When finding the median of a data set with an
even amount of numbers, take the average of
the inner two numbers.
Notes
• The mode is the most often used number.
• Range is the difference between the largest
and smallest set of data.
Activity
• We will find the height of all the students in
class.
• When you have your height please write it on
the board and then copy the number is your
notes.
• We will use height again so please don’t
forget.
Activity
• Now let’s find the mean, median, and mode
for our data.
• Next let’s find the range.
Notes
• The median divides data in half, let’s find the
median of the lower half and the upper half.
• The median of the lower half is called Q1 and
the median of the upper half is called Q3
Notes
• The five number summary is
– Minimum
– Q1
– Median
– Q3
– Maximum
Notes
• Stem and Leaf Plots
Notes
• Stem and Leaf Plots
#5 pg. 43
• Write and solve an equation to find the value
of x.
• 3.8, 4.2, 5.3, x; mean 4.8
#5 pg. 43
3.8  4.2  5.3  x
 4.8
4
13 .3  x
 4.8
4
13.3  x  19.2
x  5 .9