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

the answers c

ddd

step-by-step explanation: