20. 22+21+19+19+19 = 100. 100 divided by the amount of numbers, which is 5, equals 20.
-21
22. 21 + 19 + 26 = 66. 66/3 = 22.
Aries: Mar 21 - Apr 19 Taurus: Apr 20 - May 20 Gemini: May 21 - Jun 20 Cancer: Jun 21 - Jul 22 Leo: Jul 23 - Aug 22 Virgo: Aug 23 - Sep 22 Libra: Sep 23 - Oct 22 Scorpio: Oct 23 - Nov 21 Sagittarius: Nov 22 - Dec 21 Capricorn: Dec 22 - Jan 19 Aquarius: Jan 20 - Feb 18 Pisces: Feb 19 - Mar 20
491
Aries: March 20 - April 20 Taurus: April 21 - May 20 Gemini: May 21 - June 21 Cancer: June 22 - July 22 Leo: July 23 - August 22 Virgo: August 23 - September 21 Libra: September 22 - October 22 Scorpio: October 23 - November 21 Sagittarius: November 22 - December 21 Capricorn: December 22 - January 20 Aqaurius: January 21 - February 18 Pisces: February 19 - March 19
2,870,795,128,037,760 or approx 2.871*1015
All the numbers are composite except the ones in bold: 18 19 20 21 22 23 24 25.
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})
No number appears more than once, so there is no mode.
Aries March 21 - April 19 Taurus April 20 - May 20 Gemini May 21 - June 20 Cancer June 21 - July 22 Leo July 23 - August 22 Virgo August 23 - September 22 Libra September 23 - October 22 Scorpio October 23 - November 21 Sagittarius November 22 - December 21 Capricorn December 22 - January 19 Aquarius January 20 - February 18 Pisces February 19 - March 20
18+19+20+21+22