Question

How do you find the range, variance, and standard deviation of a set of data?

Answer 1

The range of a set is the largest value of the set minus the smallest value of the set.
The variance: Make N the mean of the set, the variance is then (X0 + N)^2 + (X1 + N)^2 + ... (Xn + N)^2

Answer 2

so the rage should be one number, correct?

Answer 3

Standard deviation is the square root of the variance.

Answer 4

Suppose we have set of reals S = {0, 2, 75, -2}
The range is 75 --2 = 77

Answer 5

Range is max value - min value
\[Variance = \frac{\sum_{}^{}(X - x_{i})^{2}}{n-1}\]

Answer 6

Thanks! I'm still confused with variance

Answer 7

Suppose we have set of reals S = {0, 2, 75, -2}
The mean is S is (0 + 2 + 75 - 2) / 4 = 18.75

The variance is ((0 + 18.75)^2 + (2 + 18.75)^2 + (75 + 18.75)^2 + (18.75 - 2)^2) / (4 - 1)