The Time Between Failures for an Electrical Appliance Is Exponentially

question 1

Multiple Choice

The time between failures for an electrical appliance is exponentially distributed with a mean of 25 months. What is the probability that the next failure will not occur before 30 months have elapsed?

• A) not in excess of .2
• B) in excess of .2 but not in excess of .3
• C) in excess of .3 but not in excess of .4
• D) in excess of .4 but not in excess of .6
• E) in excess of .6

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