Posted for "John F. Herminghaus" <catignano@tele2.it>:

        If the success rate is 99.1% for both items, the probability that both
will work is .991 X .991 or 98.2%.  To put it in more understandable terms, if
the failure rate for each of two objects is 33%, it is obvious that the
failure rate of the assembly is not 10,9%.
 

"Chatfield S. Daniel" <csdaniel@FNBSouth.com> wrote:

"""
  """
      If
      we assume that the Chelton has a failure rate of much less than
  1% and the TruTrak ADI has a failure rate
      of much less than 1%, then the probability that they will both
  fail is much, much, much less than 1%.
 """

  Mathematically it is actually 1% X 1% which is .01%

  Chat Daniel
"""