Analysis: (1) This purchase is unreasonable. If you sell more yards, you should buy more. If there are too many yards left, you should reduce them reasonably.

(2) When the shoe store determines the purchase quantity, it takes the model as a measure. Solution: (1)36 yards, 38 yards can be moderately reduced, 35 yards, 37 yards and 39 yards can be moderately reduced.

(2) Shoe stores should take the mode as the reference value when determining the purchase quantity, and purchase more goods. Comments: This topic mainly examines the application of the model in real life, and also examines students' observation and analysis ability.