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In 1999, US teens watched television for an average of 12 1/4 hours per week (Nielson Media Research).

The average earnings in 1998 for people 18 or older was $16,124 per year (without a high school diploma); $22,895 per year (with a high school diploma ); and $40,478 per year (with a university degree). (US Census Bureau).

On average, fast-food cooks make $6.29 an hour, service-station attendants make $7.34 an hour, machinists make $14.35 an hour, mail carriers make $16.39 an hour, and physical therapists make $27.49 an hour (US Bureau of Labor Statistics).

In 1998, US production workers averaged 34.6 hours per week on the job. Their average hourly wage was $12.77; their average weekly earnings were $441.84 (US Bureau of Labor Statistics).

In 1997, the US metropolitan area with the highest average annual salary was San Jose, California. Workers there earned an average of $48,702 per year (US Bureau of Labor Statistics).

In 1998, men with a bachelor’s degree earned an average of $50,272 per year, while women with a bachelor’s degree earned $30,692 (US Census Bureau).

On average, elephants in captivity live 40 years, guinea pigs 4 years, and opossums 1 year. Animals in the wild rarely live to their maximum potential life span.

Whenever a set of data is summarized by an average or mean, a measure to indicate how the data are spread around the mean should be reported as well. One such measure is called the standard deviation. It describes a typical amount that the data values may differ from the mean.




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