15, 15, 20, 24, 25, 25, 30
Mode: 22
Median: 24
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20 appears more than any number, so it is the mode.
The median is 17.5
(1st way) 21, 24, 25, 25, 25 - [21+24+25+25+25] / 5 = 120 / 5 = 24 (mean) (median = 25 - middle #) ~ (2nd way) 18, 24, 25, 26, 27 - [18+24+25+26+27] / 5 = 120 / 5 = 24 (mean) (median = 25 middle #) ~ (3rd way) 10, 20, 25, 30, 35 - [10+20+25+30+35] / 5 = 120 / 5 = 24 (mean) (median = 25 middle #)
The mode is the number that most often occurs. As both 19 and 22 occur three times, then there is no mode.
The are 11, 17 and 24.