22
Add the numbers, then divide by the number of numbers (in this case 5).
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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.
30-17 = 13
The prime numbers are: 13, 17, 3 and 7
Mean is the average of all the numbers.Sum of all the listed numbers = 584Total of all the listed numbers = 25584 / 25 = 23.36Mean = 23.36
13+17 = 30 13-17 = -4 But 17-13 = 4