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Presentation transcript:

Backpacks on chairs if they don’t fit on hangers

Lesson Topic: Describing the Center of a Distribution Using the Median Lesson Objective: I can…  I can calculate the median when given a data set.  I can estimate the percent of values above and below the median value.

4 CORNERS  The median is a data value.  Always  Sometimes  Never

TRUE or FALSE  The median is a measure of center

TRUE or FALSE  The median is a measure of variability

TRUE or FALSE  50% of values are above the mean, and 50% of values are below the mean.

TRUE or FALSE  Numbers do not have to be put in order to determine the median.

The Median  Is the midpoint of a set of ordered data.  The median isn’t always a data value.  Separates a data distribution into two equal parts, with half of the data greater than the median, and half less than it.

Strategies for finding the Median  Order the data first  If data is given in a dot plot, frequency table, etc. list out the numbers  Cross out the maximum and minimum values continuously until students reach one number in the middle if there are an odd number of data values, or two numbers for an even number of values then find the mean of the two values.

Exercise A restaurant tallied a sample of bags of French fries and found the results left. a. How many bags of fries did they count? b. What is the median number of fries for the sample of bags from this restaurant?

Exercise, Continued… The restaurant decided to divide the data into four parts. c. List the 13 values of the bottom half. Find the median of these 13 values. d. List the 13 values of the top half. Find the median of these 13 values.