152 5 150 (475 145 Time Spent Electricity 1425 Month at Home Bill ($) (hours) January 240 128 February 225 126 Electricity Bill ($) March 212 115 April 264 144 May 282 146 June 198 108 July 234 142 August 254 142 1125 110 107 5 200 220 240 260 280 Time Spent at Home (hours) Using the scatter plot, find the correlation coefficient of this data set. The correlation coefficient (r) is The correlation coefficient can be improved by ignoring the bill for the month of