Remove the unnecessary parentheses so it would be -1.3x - 4.5 + 2.1x -3.6. combine the like terms -1.3x & + 2.1x & it becomes 0.8x & then you combine -4.5 -3.6 & it becomes -8.1 so your answer is 0.8x-8.1 !! let me know if that was right
The formula of Mean Absolute Deviation is:
MAD = ∑|x- x̄|
----------
n
Where:
x = data value
<span>x̄ = mean
</span>n = number of observations
You already have 2 values given which is the mean (7) and the number of observations (10). First you need to solve for the sum of x - <span> x̄. Let's put that in a table to get a better picture:
x <span>|x-</span></span>x̄|
<span>4 |4-7| = 3
4</span> |4-7| = 3<span>
6</span> |6-7| = 1<span>
6</span> |6-7| = 1<span>
7</span> |7-7| = 0<span>
8</span> |8-7| = 1<span>
8</span> |8-7| = 1<span>
8</span> |8-7| = 1<span>
9</span> |9-7| = 2<span>
10</span> |10-7| = 3
Now get the sum of the values in the column |x-x̄|.
3+3+1+1+0+1+1+1+2+3 = 16
Now that you have the sum you can input it into the first formula:
MAD = ∑|x- x̄|
----------
n
MAD = 16
----------
10
MAD = 1.6
The answer is then B.
I kind a get the answer for this one but I’m not sure if that’s the correct one but I think your answer will be -6
<u>answer:</u>
<u>work:</u>
| distribute the negative into the parentheses, which means multiply into the parentheses.
| combine like terms
| final answer
correct me if anything is wrong, otherwise hope this helps! ❤ from peachimin