Question 1053821
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Hi  
	midPt	#		
8-11	9.5	17	161.5	
12-15	13.5	29	391.5	
16-19 	17.5	16	280	
20-23 	21.5	46	989	
24-27 	25.5	34	867	
		142	2689	
		2689/142 =	18.93661972	mean