  Extropy and its properties are explored to quantify the uncertainty. In this
paper, we obtain alternative expressions for cumulative residual extropy and
negative cumulative extropy. We obtain simple estimators of cumulative
(residual) extropy. Asymptotic properties of the proposed estimators are
studied. We also present new estimators of cumulative (residual) extropy when
the data is right censored. The finite sample performance of the estimators is
evaluated through Monte Carlo simulation studies. We use the proposed
estimators to analyse different real data sets. Finally, we obtain the
relationship between different dynamic and weighted extropy measures and
reliability concepts, which leads to several open problems associated with
these measures.
