The time taken by an automobile mechanic to complete an oil change is random with mean 29.5 minutes and standard deviation 3 minutes.
a. What is the probability that 50 oil changes take more than 1500 minutes?
b. What is the probability that a mechanic can complete 80 or more oil changes in 40 hours?
c. The mechanic wants to reduce the mean time per oil change so that the probability is 0.99 that 80 or more oil changes can be completed in 40 hours. What does the mean time need to be? Assume the standard deviation remains 3 minutes.
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What is true about the second phase of the Repair Order Tracking Sheet?
A. The parts should already be “pulled” before the technician is assigned the job B. The technician must tell the service consultant the time the job was started C. Both A and B D. Neither A nor B
Nonliving systems are biotic
Indicate whether the statement is true or false
A General Motors vehicle is being checked using mode $06 for the proper operation of the oxygen sensor. The rich-to-lean sensor switch time is 0.030 seconds. Technician A says that this indicates a slow-reacting oxygen sensor. Technician B says that the oxygen sensor is reacting correctly and is okay. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians D) Neither technician
A sling psychrometer is used to measure which air condition?
A. wet bulb temperature B. dry bulb temperature C. both a and b