19
The average is 15.
In the example provided, the quartiles are: 25% = 16.5 (the median of {15, 16, 17, 18}) 50% = 18.5 (the median of {15, 16, 17, 18, 19, 20, 21, 22}) 75% = 20.5 (the median of (19, 20, 21, 22})
17, 19, 21
17, 19, 23, 29 and 31 are prime. 15, 21, 25 and 27 are composite..
19
The average is 15.
You add the numbers, then divide the result by 3. In this case you divide by 3 because there are 3 numbers.
In the example provided, the quartiles are: 25% = 16.5 (the median of {15, 16, 17, 18}) 50% = 18.5 (the median of {15, 16, 17, 18, 19, 20, 21, 22}) 75% = 20.5 (the median of (19, 20, 21, 22})
17, 19, 21
17, 19, 23, 29 and 31 are prime. 15, 21, 25 and 27 are composite..
Add all of the numbers, and divide the result by how many numbers there are.21 + 17 + 14 + 28 + 15 = 9595 / 5 = 19
15, 17, 19 and 21.
(21+15+19+28+10+17+9+15+26+14+10+18+24+12+16) / 15 = 16.93 recurring (that is, 16.93333...)
min= 12 max=21 median=17 mode=17 mean=191
21
15, 17, 19, 21 and 23.