The Facebook Marketplace app is primarily focused on connecting sellers with interested buyers and getting them to complete a transaction. Users can browse through local business listings posted by local businesses and also check out items listed by other users. The app also has a section for users to post...

Measures of dispersion or spread give us some idea of how the values of a distribution cluster around the average and to what extent the observations differ from the mean. The three main measures of dispersion of a distribution are the range, the variance and the standard deviation.