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Um supermercado recebe fruta tropical proveniente de dois fornecedores, A e B. Enquanto A fornece caixas de 20 frutos, B fornece caixas maiores com 100 frutos cada uma. Alguns dos frutos, sem qualidade, têm peso inferior ao peso estabelecido para que seja considerado aceitável pelo supermercado.
Com vistas a comparar a qualidade dos frutos fornecidos por A e B foi feito um estudo, obtendo-se os seguintes dados:
Fornecedor A
|
Número de frutos sem qualidade |
Número de caixas |
0 |
25 |
1 |
36 |
2 |
19 |
3 |
11 |
4 |
5 |
5 |
4 |
Fornecedor B
|
Número de frutos sem qualidade |
Número de caixas |
0 - 4 |
17 |
5 - 9 |
49 |
10 - 14 |
22 |
15 - 19 |
8 |
20 - 24 |
3 |
25 - 29 |
1 |
A média de frutos sem qualidade, por caixa, para os fornecedores A e B é, respectivamente,
Uma transportadora promete entregar mercadorias em, no máximo, 24 horas, para qualquer endereço no país. Se o prazo das entregas segue distribuição de probabilidade normal, com média de 22 horas e desvio padrão de 40 minutos, o percentual de mercadorias que demoram mais do que as 24 horas prometidas para chegar ao seu destino é
Estatísticas do Departamento de Trânsito sobre o envolvimento de motoristas em acidentes com até 2 anos de habilitação indicam que o seguinte modelo pode ser adotado, ou seja, a variável aleatória X representa o número de acidentes e assume valores 0, 1, 2, 3 e 4:
Número de Acidentes (X) |
0 |
1 |
2 |
3 |
4 |
P(X = x) |
0,3 |
0,2 |
0,1 |
0,1 |
0,3 |
O valor esperado e o desvio padrão da variável aleatória X são, respectivamente,
Text II
Off the Deep End in Brazil
Gerald Herbert
With crude still hemorrhaging into the Gulf of
Mexico, deep-water drilling might seem taboo just
now. In fact, extreme oil will likely be the new normal.
Despite the gulf tragedy, the quest for oil and gas in
5 the most difficult places on the planet is just getting
underway. Prospecting proceeds apace in the ultra-
deepwater reserves off the coasts of Ghana and
Nigeria, the sulfur-laden depths of the Black Sea, and
the tar sands of Venezuela’s Orinoco Basin. Brazil’s
10 Petrobras, which already controls a quarter of global
deepwater operations, is just starting to plumb its 9 to
15 billion barrels of proven reserves buried some four
miles below the Atlantic.
The reason is simple: after a century and a
15 half of breakneck oil prospecting, the easy stuff is
history. Blistering growth in emerging nations has
turned the power grid upside down. India and China
will consume 28 percent of global energy by 2030,
triple the juice they required in 1990. China is set to
20 overtake the U.S. in energy consumption by 2014.
And now that the Great Recession is easing, the
earth’s hoard of conventional oil is waning even
faster. The International Energy Agency reckons the
world will need to find 65 million additional barrels a
25 day by 2030. If the U.S. offshore-drilling moratorium
drags on, look for idled rigs heading to other shores.
Available in:
<http://www.newsweek.com/2010/06/13/off-the-deep-end-in-brazil.html>
Retrieved on: June 19, 2011.
In Text II, Herbert illustrates the possibility of “...idled rigs heading to other shores.” (line 26) EXCEPT when he mentions
Text II
Off the Deep End in Brazil
Gerald Herbert
With crude still hemorrhaging into the Gulf of
Mexico, deep-water drilling might seem taboo just
now. In fact, extreme oil will likely be the new normal.
Despite the gulf tragedy, the quest for oil and gas in
5 the most difficult places on the planet is just getting
underway. Prospecting proceeds apace in the ultra-
deepwater reserves off the coasts of Ghana and
Nigeria, the sulfur-laden depths of the Black Sea, and
the tar sands of Venezuela’s Orinoco Basin. Brazil’s
10 Petrobras, which already controls a quarter of global
deepwater operations, is just starting to plumb its 9 to
15 billion barrels of proven reserves buried some four
miles below the Atlantic.
The reason is simple: after a century and a
15 half of breakneck oil prospecting, the easy stuff is
history. Blistering growth in emerging nations has
turned the power grid upside down. India and China
will consume 28 percent of global energy by 2030,
triple the juice they required in 1990. China is set to
20 overtake the U.S. in energy consumption by 2014.
And now that the Great Recession is easing, the
earth’s hoard of conventional oil is waning even
faster. The International Energy Agency reckons the
world will need to find 65 million additional barrels a
25 day by 2030. If the U.S. offshore-drilling moratorium
drags on, look for idled rigs heading to other shores.
Available in:
<http://www.newsweek.com/2010/06/13/off-the-deep-end-in-brazil.html>
Retrieved on: June 19, 2011.
According to Text II, in spite of the oil spill disaster in the Gulf of Mexico,
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