a) 75, 77, 78, 81, 83, 86, 92, 94, 98, 106
Explanation : Basically, you just take the number on the right, and add it to the number to the left.
b) Remember, to find the mean, you must add everything up, and then divide it by how many numbers you added together.
So :
75 + 77 + 78 + 81 + 83 + 86 + 92 + 94 + 98 + 106 = 870
Then, divide 870 by 10, because we added 10 numbers together.
870 ÷ 10 = 87
So, our mean is 87
c) Remember, to find the MAD, we must subtract the mean from each data point.
So :
75 - 87 = -12
77 - 87 = -10
78 - 87 = -9
81 - 87 = -6
83 - 87 = -4
86 - 87 = -1
92 - 87 = 5
94 - 87 = 7
98 - 87 = 11
106 - 87 = 19
Then, add all of those values up, and find the mean of that.
*Remember, when finding the MAD, everything is a positive.
12 + 10 + 9 + 6 + 4 + 1 + 5 + 7 + 11 + 19 = 84
Divide 84 by 10.
84 ÷ 10 = 8.4
So, our MAD is 8.4
~Hope I helped!~
