Add all the numbers; count how many there are, divide the sum by this count.
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57 questions right out of 62 is 91.94%.
-20
53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64
7-62 = -55
Step 1: Find the mean Step 2: Find the deviation from the mean Step 3: Take the absolute value of the deviation Step 4: Find the mean of the absolute deviation. x----x-mean 63 63-63 0 69 69-63 6 62 62-63 -1 57 57-63 -6 64 64-63 1 mean = (63+69+62+57+64)/5 = 63 Taking the absolute deviations, we have 0,6,1,6,1 Averaging these deviations : (0+6+1+6+1)/5 =14/5 = 2.8 Mean absolute deviation = 2.8