The lifespans in hours of a brand of batteries is approximately

| April 14, 2018

The lifespans in hours of a brand of batteries is approximately bell-shaped with a mean of 72 hours and astandard deviation of 5 hours. Use the Empirical Rule to answer the questions below. Provide a well-labeledsketch to support your answers. [9]Sketch:a) What percentage of batteries are expected to last more than 77 hours?b) Approximately what percentage of batteries should last between 62 and 77 hours?

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