A mobile phone company nds the lifespan for one brand of its mobile phones is normally distributed with a mean of 48.400 hours (approx. 5.5 years] and a standard deviation of 5000 hours. Answer the foliowi ng: '1. If the manufacturer is willing to replace no more than 10% of the mobile phones. what should he the approximate number of hours fora warranty? Note: Express your answer in whole number. Blank 1 2. What is the probability that a mobile phone will last between 36.400 hours and 44,400 hours? Note: Express your answer in four decimal places. Blank 2 3. What is the probability that a mobile phone will last at least 55.900 hours? Note: Express your answer in four decimal places. Blank 3