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measure of center-(mean, median) value at the middle
mean-add em up and divide by the number, not resistant
resistant-outliers don't cause it to change
median-the middle value when arranged in order, resistant, can be the mean of the two middle numbers
mode-the number that occurs the most, can have multiple or none
midrange=(maximum+minimum)/2, not resistant
WHEN SKEWED RIGHT THE MEAN IS HIGHER THAN THE MEDIAN
mean of a frequency distribution
-multiply each frequency and the class midpoint and add the product, divide by the sum of frequencies, page 88
weighted mean
-same as frequency but instead of frequency you use weight and instead of classes you use data values, page 89
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