Wednesday, June 13, 2012

Measures of Central Tendency (Median, Mode & Mean)

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. 2,3.4,5,6,5,4,5,3,4,5,6,7,5,3,4,3

Median- the middle number in a set of data after the data has been arranged in order
median of 2,5,6,8,9 is
median of 1,3,6,8,9,10 is 7

Mode- the most frequently occuring number in a set of data
mode and most both have 4 letters (a way to remember what mode means)
mode of 3,5,7,7,9 is 7
mode of 2,2,4,6,6,8,11 is 2 and 6

Mean- a measure of central tendency
the sum of a set of values divided by the number of values in a set
mean of 6,4,8
add up all the numbers and divide the result by how many numbers there are
18(divided by)3=6
therefore the mean is 6

I hope you all understand this... otherwise you'll do bad on the math exam just kidding
But I hope you all understand!

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