Question: 68. Refer to Problem 67. Determine the probability that the time to failure of a machine is: (a) less than 200 hours, (b) between 300

68. Refer to Problem 67. Determine the probability that the time to failure of a machine is:

(a) less than 200 hours,

(b) between 300 and 500 hours,

(c) more than 600 hours

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