The Mayfair Department Store in Davenport, Iowa, is trying to determine the amount of sales lost while it was shut down during July and August because of damage caused by Mississippi River flood. The sales data for January through June are listed below.
Month Sales ($1000s) Month Sales ($1000s)
January 185.72 April 210.36
February 167.84 May 255.57
March 205.11 June 261.19