How Many Light Bulb Jokes -- Does It Take To Change A Light Bulb Joke?

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-- How many
light bulb jokes
-- does it take to change a light bulb joke?
Hmmmm - the probability that a given light bulb joke will be
submitted to the net in any given week is .4, and the
probability that it will have changed detectably since the
last transmission is .2 . Hence (assuming independence, which
is reasonable since no submitter of a light bulb joke ever
seems to know it has been submitted before, within the last 2
or 3 weeks), the probability that it will change in a given
week is .08. So it takes about 12.5 light bulb jokes to
change a light bulb joke.

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