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2 answers:
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To find the slope of a line, we can use the following formula:
m-term stands for slope or gradient. The formula is useful whenever you want to find a slope of two points.
Let these be the following:
Substitute the points in formula:
Negative multiply negative always come out as positive.
Since m stands for slope, we can say that:
Answer and Step-by-step explanation:
Variance is the measurement of the spread bewteen the numbers of the data set and can be calculated by the formula:
σ² = ∑(x - ⁻x)² / n
1) With the data, find its mean (⁻x) by adding all the values and dividing the sum by total number of elements the data has;
2) Subtract each value of the data to the mean;
3) Square the result of the subtractions;
4) Add the squares;
5) Divide the sum by the total number of elements of the set;
6) The result is the Variance (σ²);
Standard Deviation is the measure of how far the values of the data set are from the mean and it is the square root of Variance:
σ =
So, to calculate standard deviation, you just take the square root of the variance.