The average life of a battery is advertised at 74 hours. A quality control check found that the mean life was normally distributed at 74 hours, with a standard deviation of 17 hours. Refer to the table in npendix. 1 . Determine the value above which 80 percent of the values will occur. (Round ascore computation to 2 decimal ploces and the final onswer to 2 decimal places.)