The amount of time a certain brand of light bulb lasts is normally distribued with a mean of 2000 hours and a standard deviation of 50 hours. Using the empirical rule, what percentage of light bulbs last between 1950 hours and 2050 hours?.

Mrs. avila is buying a wallpaper border to go on all of her kitchen walls. she wants to buy 5 extra feet of wallpaper border than she needs to be sure she has enough. she buys 55.5 feet of the border. the store owner selling the border uses the width of mrs. avila's kitchen to determine that the length of her kitchen must be 14.5 feet.