A random bulb from a batch of light bulbs has the probability D(t) = 1 − e−rt of failing before t

hours. If the mean lifetime of such bulbs is 1000 hours, what is the value of r?

hours. If the mean lifetime of such bulbs is 1000 hours, what is the value of r?

## This question was asked on Mar 20, 2010.

### Recently Asked Questions

- Please refer to the attachment to answer this question. This question was created from Katelynn Owen.docx.

- Please refer to the attachment to answer this question. This question was created from Katelynn Owen.docx.

- Let g(x, y) = kx^2 + y^2 − 4xy, where k is some constant. Determine the values of k (if any) for which the critical point at (0, 0) is a local minimum.