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84.75 is the mean of 88, 91, 74 and 86.
The average is 89.
The median is the average of 85 and 87, that is 86.The median is the average of 85 and 87, that is 86.The median is the average of 85 and 87, that is 86.The median is the average of 85 and 87, that is 86.
86 - 47 = 39
86 multiplied by 65 is 5,590.