ldl++(6)> query exact_avg(P)
query exact_avg(P)

Querying : exact_avg(P) ... 
	(2500.5)

	The number of records is 1.

ldl++(8)> query appro_avg(P)
query appro_avg(P)

Querying : appro_avg(P) ... 
	((1986.8, 10))
	((2358.4, 20))
	((2545.1, 30))
	((2531.15, 40))
	((2576.3, 50))
	((2752.9, 60))
	((2798.33, 70))
	((2748.68, 80))
	((2691.19, 90))
	((2607.57, 100))
	((2521.65, 110))
	((2578.58, 120))
	((2588.52, 130))
	((2634.3, 140))
	((2638.63, 150))
	((2624.61, 160))
	((2613.79, 170))
	((2572.97, 180))
	((2546.43, 190))
	((2542.59, 200))
	((2527.82, 210))
	((2528.1, 220))
	((2518.51, 230))
	((2512.3, 240))
	((2532.28, 250))
	((2545.23, 257))

	The number of records is 26.
ldl++(9)>