A gardener wants to develop a forecast for next year 's quarterly sales of cactus trees . He has collected quarterly sales for the past two years and expects total sales for next year to be 500 cactus trees the data clearly exhibit seasonality . How much can he expect to sell during each quarter of next year accounting for seasonality ?

Cactus trees sold

season year 1 year 2

Fall 110 100

Winter. 72 85

spring 160 153

summer 100 105

Season Forecast

Fall

Winter

Spring

Summer