How do you find the variance when given the frequency?
Formula for Population Variance
The variance of a population for grouped data is: σ2 = ∑ f (m − x̅)2 / n.
Does range determine variability?
The range is a measure of variability because it indicates the size of the interval over which the data points are distributed. A smaller range indicates less variability (less dispersion) among the data, whereas a larger range indicates the opposite.