This paper offers class mark estimators for the intervals of a grouped frequency distribution, derived by parabolic interpolation between any given interval and its adjacent intervals. The objective ...

Grouped frequency tables are a way of showing data in groups. Set up a new column to write the midpoint of each class. Set up another column to multiply each midpoint by its frequency. Find the sum of ...

This is a preview. Log in through your library . Abstract We have examined the statistical requirements for the detection of mixtures of two lognormal distributions in doubly truncated data when the ...