Hopper Coal Load
Hopper Coal Load
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 Great Northern MTH Premier SIX Car 2 Bay Offset Hoppers w Coal Load New in Box  US $299.99
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 MTH Premier Baltimore BO 2 Bay Offset Hopper w Coal Load 6 Car Set 20 90612 US $289.00
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 MTH Premier Baltimore BO 2 Bay Fish Belly Hopper w Coal Load 6 Car Set 90571 US $281.00
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 6 Western Maryland 70 Ton 3 Bay Hoppers Coal Load US $259.99
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 MTH PREMIER O 20 90133 4 BAY HOPPER W COAL LOAD NORTHERN PACIFIC 6 CAR SET MSIB US $249.99
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 RARE MTH PREMIER PROTOTYPE READING 4BAY HOPPER W COAL LOAD 6 CAR SET 20 90069 US $189.99
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 Marx Ameritrains Lot No 9 BMLP Hopper w Coal Load Mint Rare Edition US $185.00
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 MTH Train Reading Hopper Car Coal Load O 30 79118 US $111.99
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 READY MADE TRAINS 2 BAY COAL HOPPER w COAL LOAD PPL PENN POWER 2 PK O SCALE US $84.95
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 READY MADE TRAINS 2 BAY COAL HOPPER w COAL LOAD NYOW WADDELL COAL 2 PK US $84.95
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 READY MADE TRAINS 2 BAY COAL HOPPER w COAL LOAD SOUTHERN 2 PK US $79.95
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 READY MADE TRAINS 2 BAY COAL HOPPER w COAL LOAD NEW HAVEN 2 PK US $79.95
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 READY MADE TRAINS 2 BAY COAL HOPPER w COAL LOAD NORFOLK SOUTHERN 2 PK O SCALE US $79.95
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 READY MADE TRAINS 2 BAY COAL HOPPER w COAL LOAD ALASKA RAILROAD 2 PK O SCALE US $79.95
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 Lionel Trains 6 26429 Pennsylvania Coal Goes to War 4 Bay Coal Hopper with Load US $65.00
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 Lionel Trains 6 26430 Canadian Pacific 4 Bay Coal Hopper with Load US $65.00
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 Lionel Trains 6 26437 CSX 4 Bay Coal Hopper with Load US $65.00
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 LIONEL 6 27131 CONRAIL 3 BAY OPEN HOPPER WITH COAL LOAD US $64.95
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 MTH O SCALE PITTSBURGH COAL COMPANY 80526 2 BAY FISH BELLY HOPPER COAL LOAD US $59.97
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 MTH O SCALE PITTSBURGH AND MOON RUN 8952 2 BAY FISH BELLY HOPPER WITH COAL LOAD US $59.97
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 MTH O SCALE PITTSBURGH AND MOON RUN 8958 2 BAY FISH BELLY HOPPER WITH COAL LOAD US $59.97
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 MTH O SCALE PITTSBURGH COAL COMPANY 80520 2 BAY FISH BELLY HOPPER COAL LOAD US $59.97
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 K6251 1452 D H Die Cast Smooth sided 2 Bay Hopper w real coal load 2C US $59.95
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 MTH Premier 221025 Pennsylvania 34 Composite Hopper Car w Coal Load 20 97280 US $55.00
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 MTH Premier 221032 Pennsylvania 34 Composite Hopper Car w Coal Load 20 97280 US $55.00
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 MTH Premier 867867 NYC New York 2 Bay Offset Hopper Car w Coal Load 20 97734 US $55.00
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Statistics, need help!?
Coal is carried from a mine in West Virginia to a power plant in New York in hopper cars on a long train. The automatic Hopper Car loader is set to put 85 tons of coal into each car. The actual weights of coal loaded into each car is normally distributed with a mean=85 tons and standard deviation of 2 tons.
a). What is the probability that one car chosen at random will have less than 83 tons of coal
b). What is the probability that five cars chosen at random will have a mean load weight x(bar) of less than 83 tons of coal?
a.) z-score = (83 - 85) / 2 = -2 / 2 = -1
P(z<=-1) = 0.1587
b.) z-score = (83 - 85) / (2 / sqrt(5)) = -2 * sqrt(5) / 2 = -sqrt(5)
P(z<=-sqrt(5)) = 0.0127
Categories: Model Trains O Scale