dlsud.edu20.orgl DLSU-D College/GS U'UOLJHUUJ. UULVlL-J. 1.3L OCJJJ. \\ w [I Practice Exercises on Estimation ___' Question 3 of 9 2 Points Fill in the blanks: An electrical rm manufactures light bulbs that have a length of life that is approximately normally distributed, with a standard deviation of 40 hours. How large a sample is needed if we wish to be 96% condent that our sample mean will be within 10 hours of the true mean? Status Pause Cancd Pop up instructions Questions