Just over 20
18 + 19 + 21 + 23 = 81
81 / 4 (numbers) = 20.25
23
5
22
All the numbers are composite except the ones in bold: 18 19 20 21 22 23 24 25.
(-18-23+20)/3= (-21)/3=-7
20.37 is the mean.
which of the numbers 19 21 23 and 25 has the most factors
21 is composite. 19 and 23 are prime.
Hourly
20 21 22 23 24 18 19
Average of 21, 24, 21 and 23 = (21+24+21+23)/4 = 22.25
From December 19, 2012 to Dececember 18, 2013, you are 21. On December 19, 2013, you are 22 until December 18, 2014, when you turn 23.