51 appears more than any other number, so it is the mode.
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Range: 34 Mean: 21.71 Median: 15 Mode: 10
Mode is the most frequent. Sorting to make it easier to see the frequency of the numbers: {13, 16, 17, 21, 25, 25, 30} - 25 appears twice and every other number once. Thus: mode of the numbers is 25.
(12/25) / 21 dividing is the same thing as multiplying by the reciprocal. therefore you can say... (12/25) * (1/21) = 12/525
All of the numbers appear once and as a mode is the most commonly occurring number, there is no mode.
25 + 15 + 21 + 10 + 11 = 82