What is the missing value in the data set that would make the mean equal 80? show your work or explain how you got your answer. {71, 91, 82, 90, 88, 61, 70, __ }

all the numbers have to equal 640

because mean is add the all up and devide by how many. Theres 8 numbers and times that by 80 to get 640

so add them all up

71

91

82

90

88

61

70

553

subtract 640 by 553

youre answer is 87

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