Sales of Airconditioners (in Temperature (in degrees Month thousands of PHP) Celsius) Jan 727 27 Feb 766 28 Mar 797 29 Apr 853 30 May 991 31 Jun 1024 32 Jul 801 31 Aug 743 29.5 Sep 721 29 Oct 711 28 Nov 698 27 Dec 541 26 What is the Covariance of this Sample Data? (round off to 2 decimal places, Note: if whole number, just add two zeroes after the decimal point - ex. 26 becomes 26.00)