hi allstat,
pls kindly help me with these probability problems:
1. Two defective tubes got mixed up with two good ones. The tubes
are tested one by one until both defectives are found.
a)What is the probability that both defectives have been found by
the second test?
b)What is the probability that three tests are required?
c)What is the probability that four tests are required?
2. In a certain city, 15% of the households are classified as being
of the “upper class”, according to socio-economic criteria. In
addition, it is known that 95% of upper-class households own
colored television sets. It is known that 30% of households that
are not of upper-class status own a TV set. If a sample household
is to be selected for interview such that all the households of
the city are equally likely to be selected, find the probability
that
a) it does not belong to the upper class but owns a colored
television set.
b) it owns a colored television set.
c) it belongs to the upper class, given that it owns a TV set.
3. A telephone switchboard handles 500 calls, on an average, during a
rush hour. The board can make a maximum of 25 connections per
minute. Evaluate the probability that the board will be overtaxed
during any given minute.
pls pm me the solutions or links to problems similar to the given
above, if possible, with solutions...
your help is highly appreciated...thanks a lot
marina garcia
uplb, philippines
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