Question: What would be the calculated value of the total Average SI for $2023?$ You should be able to answer this based on what you know about monthly seasonal index or by looking at the values in the previous years.

Month

Demand

Yearly average

Seasonal Index

Average SI

Deseasonalized

Time period

$1/1/2020$

$2422$

$0\mathrm{.}8226$

$0\mathrm{.}7821$

$3096\mathrm{.}6851$

$1$

$2/1/2020$

$2564$

$0\mathrm{.}8708$

$0\mathrm{.}8025$

$3195\mathrm{.}1567$

$2$

$3/1/2020$

$3080$

$1\mathrm{.}0460$

$0\mathrm{.}8798$

$3500\mathrm{.}9003$

$3$

$4/1/2020$

$3004$

$1\mathrm{.}0202$

$0\mathrm{.}9852$

$3049\mathrm{.}1713$

$4$

$5/1/2020$

$2595$

$0\mathrm{.}8813$

$0\mathrm{.}9931$

$2612\mathrm{.}9134$

$5$

$6/1/2020$

$3654$

$1\mathrm{.}2410$

$1\mathrm{.}1146$

$3278\mathrm{.}3152$

$6$

$7/1/2020$

$2725$

$0\mathrm{.}9255$

$0\mathrm{.}8311$

$3278\mathrm{.}9033$

$7$

$8/1/2020$

$2383$

$0\mathrm{.}8093$

$0\mathrm{.}8677$

$2746\mathrm{.}2448$

$8$

$9/1/2020$

$2432$

$0\mathrm{.}8260$

$0\mathrm{.}8808$

$2761\mathrm{.}0371$

$9$

$10/1/2020$

$2744$

$0\mathrm{.}9319$

$1\mathrm{.}0542$

$2602\mathrm{.}9858$

$10$

$11/1/2020$

$3600$

$1\mathrm{.}2227$

$1\mathrm{.}2851$

$2801\mathrm{.}3286$

$11$

$12/1/2020$

$4130$

$2944\mathrm{.}4167$

$1\mathrm{.}4027$

$1\mathrm{.}5238$

$2710\mathrm{.}3290$

$12$

$1/1/2021$

$2634$

$0\mathrm{.}7794$

$3367\mathrm{.}7410$

$13$

$2/1/2021$

$2508$

$0\mathrm{.}7421$

$3125\mathrm{.}3717$

$14$

$3/1/2021$

$2653$

$0\mathrm{.}7850$

$3015\mathrm{.}5482$

$15$

$4/1/2021$

$3270$

$0\mathrm{.}9676$

$3319\mathrm{.}1711$

$16$

$5/1/2021$

$3770$

$1\mathrm{.}1155$

$3796\mathrm{.}0245$

$17$

$6/1/2021$

$3588$

$1\mathrm{.}0617$

$3219\mathrm{.}1010$

$18$

$7/1/2021$

$2658$

$0\mathrm{.}7865$

$3198\mathrm{.}2844$

$19$

$8/1/2021$

$3065$

$0\mathrm{.}9069$

$3532\mathrm{.}2033$

$20$

$9/1/2021$

$3095$

$0\mathrm{.}9158$

$3513\mathrm{.}7376$

$21$

$10/1/2021$

$3634$

$1\mathrm{.}0753$

$3447\mathrm{.}2486$

$22$

$11/1/2021$

$4350$

$1\mathrm{.}2871$

$3384\mathrm{.}9387$

$23$

$12/1/2021$

$5330$

$3379\mathrm{.}5833$

$1\mathrm{.}5771$

$3497\mathrm{.}8337$

$24$

$1/1/2022$

$2810$

$0\mathrm{.}7444$

$3592\mathrm{.}7685$

$25$

$2/1/2022$

$2999$

$0\mathrm{.}7945$

$3737\mathrm{.}2367$

$26$

$3/1/2022$

$3051$

$0\mathrm{.}8083$

$3467\mathrm{.}9373$

$27$

$4/1/2022$

$3653$

$0\mathrm{.}9677$

$3707\mathrm{.}9303$

$28$

$5/1/2022$

$3709$

$0\mathrm{.}9826$

$3734\mathrm{.}6034$

$29$

$6/1/2022$

$3930$

$1\mathrm{.}0411$

$3525\mathrm{.}9384$

$30$

$7/1/2022$

$2949$

$0\mathrm{.}7812$

$3548\mathrm{.}4351$

$31$

$8/1/2022$

$3348$

$0\mathrm{.}8869$

$3858\mathrm{.}3414$

$32$

$9/1/2022$

$3400$

$0\mathrm{.}9007$

$3860\mathrm{.}0025$

$33$

$10/1/2022$

$4361$

$1\mathrm{.}1553$

$4136\mathrm{.}8881$

$34$

$11/1/2022$

$5079$

$1\mathrm{.}3455$

$3952\mathrm{.}2077$

$35$

$12/1/2022$

$6008$

$3774\mathrm{.}7500$

$1\mathrm{.}5916$

$3942\mathrm{.}7739$

$36$