Question 4 (22 marks) a. Triathlon store sells T2 skis at a selling price of $650. The store buys skis from a supplier at a unit cost of $230. The skis not sold during the ski season are sold at $130 after the season is over. The season's demand for skis is estimated to be normally distributed with a mean of 36 and a standard deviation of 12 . How many skis should the store order