A large on-demand, video streaming company is designing a large-scale survey to determine the mean amount of time corporate executives watch on-demand television. A small pilot survey of 10 executives indicated that the mean time per week is 15 hours, with a standard deviation of 2.5 hours. The estimate of the mean viewing time should be within 30 minutes. The 99% level of confidence is to be used. 38:28 How many executives should be surveyed? (Round the final answer to the next whole number.) Number of executives