mean - the average of a number
mode - a number that appears the most in a set of numbers
median - the number in the middle after the set of numbers are put from least to greatest
range - the difference between the largest and the smallest number in a set of numbers
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A landmark in math is referring to the: Mean, Median,Mode and Range. Sometimes it will include the Minimum and Maximum.
Measures of central tendency are the mean, median, range, mode ect.
Mean: 71 Median: 67.5 Mode: None Range: 28
Mean: 4.2 Median: 2 Mode: 1 Range: 8
Prior to the introduction of 170, the mean, median, mode and range did not exist since there were no numbers at all. Once 170 is introduced, it becomes the mean, median and mode. The range is zero.