Question: =+31. If component lifetime is exponentially distributed with parameter , obtain an expression for the proportion of components whose lifetime exceeds the mean value by

=+31. If component lifetime is exponentially distributed with parameter , obtain an expression for the proportion of components whose lifetime exceeds the mean value by more than 1 standard deviation. Hint:

According to Exercise 26, 2 5#

0 x 2

f(x) dx 2 2

;

now use integration by parts.

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