Find the Mean 90 , 90 , 95 , 100 , 80 , 75 , 80 , 70 , 60 , 95 , 100 , 100 , 100 , 75 , 80 , 90 , 90 , 90 , 70 , 70 , 80 , 85 , 90 , 90 , 85

Solution

average

90, 90, 95, 100, 80, 75, 80, 70, 60, 95, 100, 100, 100, 75, 80, 90, 90, 90, 70, 70, 80, 85, 90, 90, 85

85.2

Solution steps

Compute the sum of the data set:

i = 1 \sum n a_{i} = 2130

Compute the number of terms in the data set:

n = 25

Divide the sum by the number of terms and simplify:

85.2

= 85.2

100, 100, 90, 90, 90, 80, 80, 80, 80, 80, 70

95, 82, 77, 64, 100, 97, 95, 95, 81, 80, 80, 84, 98, 77, 61, 69, 71, 80, 100, 999

95, 45, 37, 82, 90, 100, 91, 78, 67, 84, 85, 85, 82, 91, 93, 92, 76, 84, 100, 59, 92, 77, 68, 88

95, 45, 37, 82, 90, 100, 91, 78, 67, 84, 85, 85, 82, 91, 93, 92, 76, 84, 100, 59, 92, 77, 68, 88

78, 80, 66, 68, 71, 64, 82, 71, 70, 65, 70, 75, 77, 86, 72