2 DIFFERENT QUESTIONS... PLEASE BE CLEAR W/ ANSWER

A mechanic sells a brand of automobile tire that has a life expectancy that is normally dis1n'buted, wlth a mean Iiie of 33,060 miles and a standard deviation of 2706 miles. He wants to give a guarantee For free replacement oftires that don't wear well. How should he word his guarantee ifhe is willing to replade approximately 10% ofthe rm? Click to View page 1 of the table. Cllck In View page 2 of lhe table "res that wear out by miles wlII be replaced free of charge. (Round In the nearest mie as needed.) The times per week a student um a lab computer are normally distributed. with a mean of 6.2 hours and a standard deviation of 1.3 hours. A student is randomly selected. Find the following probabilities. (a) Find the probability that the student uses a lab computer less than 4 hours per week. {b} Find the probability that the student uses a lab computer between ? and 5 hours per week. to) Find the probability that the student uses a lab computer more than 9 hours per week. {a} The probability that a student uses a lab computer less than 4 hours per week is (Round in three decimal places as needed.) {b} The probability that a student uses a lab computer between 7 and B hours per week is {Round in three decimal places as needed.) (c) The probability thata student use: a lab computer more than 9 hours per week is {Round in three decimal places as needed.)