June 6th Notes

Measures Of Central Tendency
-a value that represents the centre of a data set
-can be the mean, median, or mode
-data set is a group of numbers that you must arrange in order from least to greatest
eg. 2, 3, 4, 5, 6, 5, 4, 5, 3, 4, 5, 6, 7, 5, 34, 3 (not organized)
2, 3, 3, 3, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 7, 34 (organized)

• Median- the middle number in a set of data after the data have been arranged in order

eg. median of 2, 5, 6, 8, 9 is 6

• Mode- the most frequently occurring number in a set of data

-mode and most both have 4 letters (a way to remember)
-mode of 3, 5, 7, 7, 9 is 7
-mode of 2, 2, 4, 6, 6, 8, 11, is 2 and 6 (can have more than 1 mode)

• Mean- a measure of central tendency

- the sum of a set of values divided by the number of values in the set
-mean of 6, 4, 8 is 6 (6+4+8= 18/3= 6)
-add up all the numbers, divide by how many numbers there are

• Range- the positive differences between the largest and smallest values in a data set

-range of 1, 3, 4, 5, 5, 6, 6, 8, 8, 9 is 8 (9-1= 8)
-range of -7, -4, -2, -1 is 6 (-1) - (-7)= 6

• Outlier- a value that is much larger or smaller than the other data value

-the data set may have more than 1 outlier or zero outliers
-outliers for 1, 64, 65, 67, 67, 68, 100 are 1 and 100



Here is a link to a math game:

http://ca.ixl.com/math/grade-7/calculate-mean-median-mode-and-range


Here is a math video, ENJOY!