The average is 19.
The average is (11+11+13+17)/4 = 52/4 = 13
The prime numbers after ten are: 11 13 17 19 23 29
2+3+5+7+11+13+17+19+23+29 = 129 The average is 12.9
2+3+5+7+11+13+17+19+23+29=129the average is 12.9
Error
The numbers 11, 13, 17, 19, 23 and 29 are prime.They are: 11 13 17 19 23 and 29
27 out of that list.
11, 13, 17, 19, 23, 29 . . .
They are: 11 13 17 19 23 and 29 which makes six of them
11 13 17 19 23 29
60
Add them up, divide by 10. 2 3 5 7 11 13 17 19 23 29