### What is the probability that the next failure

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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 won't occur before 30 months have elapsed?

a.

In excess of .6

b.

In excess of .4 but not in excess of .6

c.

Not in excess of .2

d.

In excess of .2 but not in excess of .3

e.

In excess of .3 but not in excess of .4

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