Ages of Moviegoers The table below shows the distribution of the ages of moviegoers (based on data from the Motion Picture Association of America). Use the data to estimate the mean, standard...

Ages of Moviegoers The table below shows the distribution of the ages of moviegoers (based on data from the Motion Picture Association of America). Use the data to estimate the mean, standard deviation, and variance of ages of moviegoers. Hint: For the open-ended category of “60 and older,” assume that the category is actually 60–80.