Arithmetic mean: grouped data
			Values						Frequency										Value x frequency
		4,000 x										2									8,000
		7,000 x										3								21,000
		8,000 x										2								16,000
	15,000 x											1								15,000
	16,000 x											1								16,000
	25,000 x											1								25,000
											10							101,000/10 = 10,100