Scenario B.6 The Jackson Machine Company Has Four Cutting Tools That Need

Multiple Choice

Scenario B.6
The Jackson Machine Company has four cutting tools that need to be refurbished after an average of 30 hours, according to an exponential distribution. The single machine that refurbishes the tools needs 15 hours for each tool on the average, with exponential service times.
-Use the information in Scenario B.6. What is the probability that there will be no tools in the system?

A) less than or equal to 0.16
B) greater than 0.16 but less than or equal to 0.19
C) greater than 0.19 but less than or equal to 0.22
D) greater than 0.22