A rope is 66 feet long. It is cut into two pieces such that one piece is half the length of the other. What is the length of the
2 answers:
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Divide both sides by 4.
Divide 8 by 4 to get 2.
Subtract 1 from both sides.
Subtract 1 from 2 to get 1.
Let x=1.
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To compute the mean, you simply have to sum all the elments in the data set and the divide the sum by the number of elements:
To compute the variance, we first need to compute the distance of each element from the mean. To do so, we build a "parallel" dataset, given by the difference of every value and the mean:
Now we need those difference squared:
The variance is the mean of this new vector, so
Finally, the standard deviation is simply the square root of the variance, so you have