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A computer repair shop has two work centers. The first center examines the computer to see what is wrong and the second center repairs the computer. Let x] and xy be random variables representing the lengths of time in minutes to examine a computer (x1) and to repair a computer (x2). Assume x1 and x2 are independent random variables. Long-term history has shown the following mean and standard deviation for the two work centers Examine computer, X1 127 2 minutes, 7.6 minutes Repair computer, 90.6 minutes; 02 15.5 minutes Let Wax1 x2 be a random variable representing the total time to examine and repair the computer There is a flat rate of $1 80 per minute to examine the computer, and if no repairs are ordered, there is an additional $70 service charge Let Z - 1.80x,+ 70. Compute the mean and standard deviation of L. OK - 59 5,61 - 187.7 Ouz -119.0,92 - 13 7 OH - 59.5, 01- 13 7 Out - 119 0 07 - 187 7 Out - 13.7 07 - 1190