all your doing is multiply and then adding because an number time 1 is the number it is multiplied by. and then keep adding and mutiply on to find you answer
Assuming the question is in the wrong format and"date" is data. I chose X= 10,11,16,9,7,15,16,10 and Y= <span>96,51,62,58,89,81,46,51 the correlation cooefficent is -0.3351