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.

Listed below are annual high values of the Dow Jones Industrial Average (DJIA) and annual mean sunspot numbers for eight recent years. Use the data for Exercises 1-5. A sunspot number is a measure of sunspots or groups of sunspots on the surface of the sun. The DJIA is a commonly used index that is a weighted mean calculated from different stock values.

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25-39 40-49 50-59 60 and older 2-11 12-17 18-24 15 Age 15 19 19 Percent DJIA Sunspot Number 7.5 14,198 13,338 10,606 11,625 12,929 13,589 16,577 18,054 16.5 55.7 57.6 64.7 79.3 2.9 3.1