The director of the riley county, kansas, library system would like to forecast evening patron usage for next week. below are the data for the past 4 weeks: mon tue wed thu fri sat week 1 210 178 250 215 160 180 week 2 215 180 250 213 165 185 week 3 220 176 260 220 175 190 week 4 225 178 260 225 176 190 a) calculate a seasonal index for each day of the week (enter your responses rounded to three decimal places).