What is the mean, median, and mode of 31, 28, 30, 31, 30?

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Answer 1 · 2017-04-07T04:38:18

Mean $=30$
Median $=30$
Mode $=30, 31$

The mean is the "average" - the sum of the values divided by the count of the values:

$(31+28+30+31+30)/5=150/5=30$

The median is the middle value in a string of values listed from lowest to highest (or highest to lowest - they just can't be scrambled up):

$28,30,30,31,31$

median $=30$

The mode is the value that is listed most often. In this case, both the 30 and 31 are listed twice, so they are both the mode.