The flashlight batteries produced by one of the northern manufacturers are known to have an average life of 50 hours with a standard deviation of hours. Use Chebyshev's theorem to answer the following questions (a) At least what percentage of flashlights will have a life of 44 to 56 hours? (Round your answer to two decimal places.) 36 (b) At least what percentage of the batteries will have a life of 42 to 50 hours? (c) Determine an interval for the lives (in hours) of the batteries that will be true for at least 60% of the batteries (Her First compute the Z-score. Round your answers to two decimal places) hours to hours