a certain brand of refrigerator is known by themanufacturer to last for 14 years with a standard deviation of of2.5 years. a)If the manufacturer guarantees them foi 10yrs, what % of them will they nneed to replace underwarranty? b) If the manufacturer does not want torepalce more than 1 % , for how many years should they guaranteethem ? a certain brand of refrigerator is known by themanufacturer to last for 14 years with a standard deviation of of2.5 years. a)If the manufacturer guarantees them foi 10yrs, what % of them will they nneed to replace underwarranty? b) If the manufacturer does not want torepalce more than 1 % , for how many years should they guaranteethem ?