Hi,

Note:   

49.5 - 59.5 4	54.5	4	218	

59.5 - 69.5 6	65.5	6	393	

69.5 - 79.5 10	75.5	10	755	

79.5 - 89.5 12	84.5	12	1014	

89.5 - 99.5 8	94.5	8	756	

		40	            3136  and  = m = 78.4

 

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