Question

The battery in an IPod has a run-time (time until it needs to be recharged) that is normally distributed with a mean of 6 hours and a standard deviation of ½ hour. Draw and label a sketch of the distribution, both with x-values and their corresponding z-scores from 3 standard deviations below the mean to 3 standard deviations above the mean.

blank #1, give your x-values left to right, with commas in between and no spaces:____________(for example, 1,2,3,4,5,6)

blank #2, give your z-scores left to right, with commas in between and no spaces:_______________________

blank #3, What proportion of ipods have a run-time between 4.8 and 6.1 hours?

blank #4, What proportion of ipods have a run-time of less than 5.2 hours?

blank #5, Find the third quartile for this run time distribution.

Answer 1