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STAT 409
Homework #13
Fall 2009
(due Friday, December 4, by 4:00 p.m.)
1.
Seventy percent of the light aircraft that disappear while in flight in Neverland
are subsequently discovered.
Of the aircraft that are discovered, 60% have an
emergency locator, whereas 90% of the aircraft not discovered do not have such
a locator.
Suppose a light aircraft that has just disappeared has an emergency
locator.
What is the probability that it will not be discovered?
2.
In a certain industry sector, 40% of the stocks went up in January.
Of the stocks
that went up in January, 80% also went up in February.
However, only 30% of the
stocks that did not go up in January went up in February.
a)
What is the probability that a randomly selected stock from this industry sector
went up in February?
b)
Suppose a stock from this industry sector went up in February.
What is the
probability that it also went up in January?
3.
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 Spring '11
 Stepanov

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