Question

Find the mean absolute deviation for the following test scores: 75, 85, 90, 100, 95, 70, 85, 90, 80, 100

Answer 1

number of observations (n) = 10

the mean be:-

the necessary calculation table :-

xi
75	|75-87| = |-12|= 12
85	2
90	3
100	13
95	8
70	17
85	2
90	3
80	7
100	13
sum=870	sum=80

the mean absolute deviation be :-

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